50 Higher-Order Thinking Skills (HOTS) MCQs (Level 3) on Fluid Dynamics, Physics (Unit-Wise MCQs Practice):

👉Physics MCQs Hub – Unit wise Physics MCQs Practice (Main-Page)👈

Whether you are preparing for Board Examinations, chapter tests, college assessments, or competitive entrance examinations (MDCAT, ECAT, NUST, PIEAS, GIKI, UET, FAST, and other engineering or medical admission tests), this comprehensive Electrostatics MCQ Collection is designed to help you master the chapter through a systematic progression from basic concepts to advanced numerical problems and Higher-Order Thinking Skills (HOTS).

This chapter-wise MCQ collection includes:

100 Basic MCQs (1–100) – Covering electric charge, Coulomb's law, electric field, electric potential, electric flux, Gauss's law, capacitors, dielectric materials, and electrostatic applications.
100 Advanced & Numerical MCQs (101–200) – Focusing on calculations, electric field and potential, Gauss's law, capacitor combinations, stored energy, and practical problem-solving.
100 HOTS MCQs (201–300) – Designed to strengthen conceptual understanding, analytical reasoning, assertion–reason questions, and multi-concept problem-solving.
50 Most Important Electrostatics Quiz MCQs – A carefully selected mix of conceptual, numerical, and HOTS questions for quick revision, self-assessment, and exam practice.

This MCQ collection helps you:

Build strong conceptual understanding of Electrostatics
Master numerical and application-based problems
Improve analytical reasoning and problem-solving skills
Strengthen preparation for objective-type examinations
Increase speed, accuracy, and confidence in solving MCQs
Prepare effectively for both Board Examinations and competitive entrance tests
Every MCQ includes the correct answer along with a clear concept-based explanation to reinforce learning and improve exam performance.
With 300 carefully selected MCQs arranged into 100 Basic, 100 Advanced & Numerical, and 100 HOTS questions, this all-in-one MCQ bank provides complete preparation for Physical Quantities and Measurement. It is an excellent study resource for strengthening concepts, improving exam performance, and achieving success in both school and competitive physics examinations.

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Electrostatics (Level 3) – 100 Higher-Order Thinking (HOTS) MCQs with Explanations

(MCQs 101–200)

(MCQs 201–225)

Coverage: Multi-Concept Reasoning, Electric Fields, Electric Potential, Gauss's Law, Conductors, Capacitors, Electrostatic Equilibrium, and Conceptual Applications.

MCQ No. 201

A positive test charge is placed exactly midway between two identical positive charges. The electric field at the midpoint is zero, but the electric potential is:

a) Zero

b) Positive

c) Negative

d) Infinite

Correct Answer: b) Positive

Explanation: Electric field is a vector quantity, so the two equal fields cancel at the midpoint. Electric potential is a scalar quantity; therefore, the potentials due to both positive charges add together, giving a positive value.

MCQ No. 202

A hollow conducting sphere is given a net positive charge. Which statement is correct?

a) Electric field is zero everywhere.

b) Electric field inside the conductor is zero, but outside it behaves like a point charge.

c) Electric field inside the cavity is always non-zero.

d) Electric potential outside is zero.

Correct Answer: b) Electric field inside the conductor is zero, but outside it behaves like a point charge.

Explanation: In electrostatic equilibrium, excess charge resides on the outer surface. The field inside the conducting material is zero, while outside the sphere the field is identical to that of a point charge located at its center.

MCQ No. 203

A charge is moved around a closed path in an electrostatic field. The net work done is zero because:

a) The charge does not move.

b) Electrostatic force is conservative.

c) Electric field is always zero.

d) Potential is always zero.

Correct Answer: b) Electrostatic force is conservative.

Explanation: Electrostatic forces are conservative, so the work done depends only on the initial and final positions. For a closed path, these positions coincide, making the net work zero.

MCQ No. 204

Two equal positive charges are fixed in space. At the midpoint between them:

a) Electric field and potential are both zero.

b) Electric field is zero but potential is positive.

c) Electric potential is zero but electric field is positive.

d) Both electric field and potential are negative.

Correct Answer: b) Electric field is zero but potential is positive.

Explanation: The fields cancel because they are equal and opposite, while the potentials add because potential is a scalar quantity.

MCQ No. 205

A dielectric slab is inserted completely between the plates of an isolated charged capacitor. Which quantity remains unchanged?

a) Capacitance

b) Electric field

c) Stored charge

d) Potential difference

Correct Answer: c) Stored charge

Explanation: Since the capacitor is isolated, no charge can enter or leave. The capacitance increases, while the potential difference and electric field decrease, but the stored charge remains constant.

MCQ No. 206

A capacitor remains connected to a battery while a dielectric is inserted between its plates. Which quantity remains constant?

a) Charge

b) Potential difference

c) Stored energy

d) Electric field

Correct Answer: b) Potential difference

Explanation: The battery maintains a constant voltage across the capacitor. As the capacitance increases, additional charge flows onto the plates.

MCQ No. 207

Why do electric field lines never intersect?

a) Electric field is a scalar quantity.

b) A point cannot have two directions of electric field simultaneously.

c) Charges repel each other.

d) Field lines are imaginary.

Correct Answer: b) A point cannot have two directions of electric field simultaneously.

Explanation: If two field lines intersected, the electric field at the point of intersection would have two different directions, which is impossible.

MCQ No. 208

Which statement best explains why excess charge always resides on the outer surface of a conductor?

a) Charges are attracted toward the centre.

b) Charges move until electrostatic equilibrium is established.

c) Conductors have no free electrons.

d) Charges disappear inside the conductor.

Correct Answer: b) Charges move until electrostatic equilibrium is established.

Explanation: Free electrons move until the electric field inside the conductor becomes zero, leaving excess charge distributed over the outer surface.

MCQ No. 209

If Coulomb's constant were doubled while all other quantities remained unchanged, the electrostatic force would:

a) Remain unchanged

b) Become half

c) Double

d) Become four times

Correct Answer: c) Double

Explanation: From Coulomb's law,

F=k\frac{q_1q_2}{r^2},

the force is directly proportional to Coulomb's constant.

MCQ No. 210

Why is electric potential considered a scalar quantity?

a) It has both magnitude and direction.

b) It is independent of work done.

c) It is defined as work done per unit charge without any directional component.

d) It depends on electric field direction.

Correct Answer: c) It is defined as work done per unit charge without any directional component.

Explanation: Electric potential has magnitude only and therefore follows scalar addition.

MCQ No. 211

Which physical law explains why the electric field inside a conductor is zero?

a) Ohm's law

b) Coulomb's law

c) Gauss's law together with electrostatic equilibrium

d) Faraday's law

Correct Answer: c) Gauss's law together with electrostatic equilibrium

Explanation: Free charges rearrange until the electric field inside the conductor becomes zero, a result consistent with Gauss's law.

MCQ No. 212

A positively charged conductor is connected to Earth. What happens?

a) Positive charges flow into Earth.

b) Electrons flow from Earth to the conductor.

c) Protons move from Earth.

d) Nothing happens.

Correct Answer: b) Electrons flow from Earth to the conductor.

Explanation: Electrons from the Earth neutralize the excess positive charge until the conductor reaches Earth's potential.

MCQ No. 213

Two charges are separated by a certain distance. If both charges and the distance are doubled, the electrostatic force will:

a) Double

b) Remain unchanged

c) Become half

d) Become four times

Correct Answer: b) Remain unchanged

Explanation:

F'=\frac{k(2q_1)(2q_2)}{(2r)^2} =\frac{4kq_1q_2}{4r^2} =F

MCQ No. 214

Why is Gauss's law particularly useful?

a) It replaces Coulomb's law completely.

b) It simplifies electric field calculations for symmetric charge distributions.

c) It applies only to moving charges.

d) It is used only for capacitors.

Correct Answer: b) It simplifies electric field calculations for symmetric charge distributions.

Explanation: For spherical, cylindrical, and planar symmetry, Gauss's law allows direct determination of electric fields.

MCQ No. 215

Which of the following quantities is path independent?

a) Work done by friction

b) Work done by electrostatic force

c) Distance travelled

d) Speed

Correct Answer: b) Work done by electrostatic force

Explanation: Electrostatic forces are conservative, so the work done depends only on the initial and final positions.

MCQ No. 216

An equipotential surface is important because:

a) Electric field is parallel to it.

b) No work is required to move a charge along it.

c) Electric field becomes infinite.

d) Electric charges disappear on it.

Correct Answer: b) No work is required to move a charge along it.

Explanation: Since every point on an equipotential surface has the same potential, the potential difference is zero and no work is done in moving a charge along it.

MCQ No. 217

A Faraday cage protects electronic equipment because:

a) It absorbs magnetic fields.

b) It blocks external electric fields by redistributing charges.

c) It stores electric charge permanently.

d) It increases electric potential.

Correct Answer: b) It blocks external electric fields by redistributing charges.

Explanation: Charges rearrange on the conducting surface, making the electric field inside the enclosure effectively zero.

MCQ No. 218

Why is the electric field stronger near a sharp point on a charged conductor?

a) More charge accumulates where the radius of curvature is small.

b) Electric potential is zero there.

c) Sharp points reduce resistance.

d) The conductor becomes an insulator.

Correct Answer: a) More charge accumulates where the radius of curvature is small.

Explanation: Charge density is greatest at sharp points, producing a stronger electric field. This principle is used in lightning conductors.

MCQ No. 219

Lightning conductors protect buildings because they:

a) Attract lightning and safely conduct it to Earth.

b) Prevent cloud formation.

c) Increase building resistance.

d) Stop electric charges from moving.

Correct Answer: a) Attract lightning and safely conduct it to Earth.

Explanation: The sharp tip creates a strong electric field, and the conductor provides a low-resistance path to the ground.

MCQ No. 220

Which quantity remains unchanged when a charge moves along an equipotential surface?

a) Electric field

b) Electric potential

c) Electric force

d) Electric flux

Correct Answer: b) Electric potential

Explanation: Every point on an equipotential surface has the same electric potential.

MCQ No. 221

A neutral conductor is brought near a positively charged rod without touching it. This phenomenon is called:

a) Conduction

b) Induction

c) Polarization of molecules only

d) Ionization

Correct Answer: b) Induction

Explanation: The electric field causes free electrons in the conductor to redistribute without direct contact.

MCQ No. 222

Why is electrostatic shielding effective?

a) Electric field inside a closed conductor becomes zero.

b) Electric field becomes infinite.

c) Charge disappears.

d) Potential outside becomes zero.

Correct Answer: a) Electric field inside a closed conductor becomes zero.

Explanation: Free charges rearrange until the electric field within the conducting enclosure vanishes.

MCQ No. 223

Which statement correctly compares electric field and electric potential?

a) Both are vector quantities.

b) Both are scalar quantities.

c) Electric field is a vector, while electric potential is a scalar.

d) Electric field is scalar, while electric potential is vector.

Correct Answer: c) Electric field is a vector, while electric potential is a scalar.

Explanation: Electric field has magnitude and direction, whereas electric potential has only magnitude.

MCQ No. 224

The principle of superposition is valid because:

a) Electric forces due to individual charges act independently.

b) Charges merge together.

c) Electric field is always uniform.

d) Coulomb's law applies only to one charge.

Correct Answer: a) Electric forces due to individual charges act independently.

Explanation: The resultant electric field or force is obtained by adding the contributions from each charge separately.

MCQ No. 225

Which statement best summarizes electrostatic equilibrium?

a) Charges continue moving indefinitely.

b) Electric field inside a conductor is zero, charges remain at rest, and the conductor becomes an equipotential body.

c) Electric potential inside a conductor is zero.

d) Electric field outside a conductor is always zero.

Correct Answer: b) Electric field inside a conductor is zero, charges remain at rest, and the conductor becomes an equipotential body.

Explanation: In electrostatic equilibrium, free charges stop moving after redistributing themselves so that the electric field inside the conductor becomes zero and the entire conductor attains the same electric potential.

(MCQs 226–250)

Coverage: Advanced Conceptual Reasoning, Multi-Step Analysis, Gauss's Law, Electric Potential, Capacitors, Electrostatic Shielding, and Real-Life Applications.

MCQ No. 226

Two identical conducting spheres carry equal positive charges. They are brought into contact and then separated. Which statement is correct?

a) The charge on each sphere becomes zero.

b) The charge on each sphere remains unchanged.

c) The total charge is equally shared between the spheres.

d) One sphere becomes negatively charged.

Correct Answer: c) The total charge is equally shared between the spheres.

Explanation: Since the spheres are identical, they have the same capacitance. When they touch, charge redistributes equally until both spheres have the same electric potential.

MCQ No. 227

A hollow conducting shell contains no charge inside its cavity. If an external charge is brought near the shell, the electric field inside the cavity will be:

a) Maximum

b) Uniform

c) Zero

d) Equal to the external field

Correct Answer: c) Zero

Explanation: The conducting shell provides electrostatic shielding. Charges redistribute on the outer surface so that the electric field inside the cavity remains zero.

MCQ No. 228

Why are birds sitting on a single high-voltage transmission wire generally unharmed?

a) The wire has no current.

b) The bird is at nearly the same electric potential at both feet.

c) Birds are perfect insulators.

d) Air prevents electric current.

Correct Answer: b) The bird is at nearly the same electric potential at both feet.

Explanation: Since there is almost no potential difference across the bird's body, very little current passes through it.

MCQ No. 229

Which statement correctly distinguishes electric field from electric potential?

a) Electric field depends on direction, whereas electric potential does not.

b) Electric potential depends on direction, whereas electric field does not.

c) Both depend on direction.

d) Neither depends on direction.

Correct Answer: a) Electric field depends on direction, whereas electric potential does not.

Explanation: Electric field is a vector quantity, while electric potential is a scalar quantity.

MCQ No. 230

A charged particle moves from a region of higher electric potential to lower electric potential. Which statement is correct for a positive charge?

a) Its electric potential energy increases.

b) Its electric potential energy decreases.

c) Its charge changes.

d) Its electric field becomes zero.

Correct Answer: b) Its electric potential energy decreases.

Explanation: Since

U=qV,

a decrease in electric potential results in a decrease in potential energy for a positive charge.

MCQ No. 231

A Gaussian surface encloses three charges: +4 μC, −2 μC, and +1 μC. The electric flux depends upon:

a) +4 μC only

b) The largest charge only

c) The net enclosed charge

d) The shape of the surface

Correct Answer: c) The net enclosed charge

Explanation: The enclosed charge is

(+4-2+1)=+3\ \mu C.

According to Gauss's law, electric flux depends only on the net enclosed charge.

MCQ No. 232

Why is the electric field inside a conductor always zero in electrostatic equilibrium?

a) Because conductors have no free electrons.

b) Because free charges rearrange until the internal field is eliminated.

c) Because electric potential is always zero.

d) Because conductors repel electric fields.

Correct Answer: b) Because free charges rearrange until the internal field is eliminated.

Explanation: Free electrons continue moving until the resultant electric field inside the conductor becomes zero.

MCQ No. 233

If the potential difference across a capacitor is doubled while its capacitance remains constant, the stored energy becomes:

a) Half

b) Double

c) Four times

d) Unchanged

Correct Answer: c) Four times

Explanation: Since

U=\frac12CV^2,

doubling the voltage increases the stored energy by a factor of four.

MCQ No. 234

A positive point charge produces electric field lines that:

a) Form closed loops.

b) End on the positive charge.

c) Originate from the charge and extend outward.

d) Remain parallel everywhere.

Correct Answer: c) Originate from the charge and extend outward.

Explanation: Electric field lines always emerge from positive charges and terminate on negative charges or at infinity.

MCQ No. 235

Which statement about electric field lines is incorrect?

a) They never intersect.

b) Their density indicates field strength.

c) They form closed loops.

d) They are perpendicular to equipotential surfaces.

Correct Answer: c) They form closed loops.

Explanation: Electric field lines begin on positive charges and end on negative charges. Unlike magnetic field lines, they do not form closed loops.

MCQ No. 236

An isolated charged capacitor has a dielectric inserted between its plates. Which quantity decreases?

a) Capacitance

b) Charge

c) Potential difference

d) Plate area

Correct Answer: c) Potential difference

Explanation: Since the capacitor is isolated, the charge remains constant while the capacitance increases. Therefore,

V=\frac{Q}{C}

decreases.

MCQ No. 237

Why is electric potential continuous across a conductor?

a) Electric charges disappear.

b) Any potential difference inside a conductor would produce charge motion until equilibrium is restored.

c) Conductors have infinite resistance.

d) Electric field is maximum inside conductors.

Correct Answer: b) Any potential difference inside a conductor would produce charge motion until equilibrium is restored.

Explanation: Charges redistribute until every point of the conductor reaches the same potential.

MCQ No. 238

Which device operates mainly on the principle of electrostatic attraction?

a) Electric fan

b) Laser printer

c) Electric heater

d) Transformer

Correct Answer: b) Laser printer

Explanation: Laser printers use electrostatic attraction to transfer toner particles from the drum onto paper.

MCQ No. 239

The electric field at a point is zero. Which statement must always be true?

a) The electric potential is zero.

b) The electric potential is constant locally but not necessarily zero.

c) No charges exist anywhere.

d) The point is at infinity.

Correct Answer: b) The electric potential is constant locally but not necessarily zero.

Explanation: A zero electric field means the rate of change of potential is zero at that point, but the potential itself may have any value.

MCQ No. 240

Two identical capacitors are connected in parallel and then connected to a battery. Compared with a single capacitor, the equivalent capacitance is:

a) Half

b) Equal

c) Double

d) Four times

Correct Answer: c) Double

Explanation: For parallel combinations,

C_{eq}=C+C=2C.

MCQ No. 241

Which statement best explains why Coulomb's law is similar to Newton's law of gravitation?

a) Both involve magnetic forces.

b) Both obey an inverse-square relationship.

c) Both act only between identical particles.

d) Both require physical contact.

Correct Answer: b) Both obey an inverse-square relationship.

Explanation: Both electrostatic and gravitational forces decrease in proportion to the square of the distance between interacting objects.

MCQ No. 242

If a conductor is placed in an external electric field, the free electrons will:

a) Remain stationary.

b) Move until electrostatic equilibrium is reached.

c) Escape from the conductor immediately.

d) Become positively charged.

Correct Answer: b) Move until electrostatic equilibrium is reached.

Explanation: Free electrons redistribute themselves so that the internal electric field becomes zero.

MCQ No. 243

Which of the following quantities is independent of the path taken between two points?

a) Electric potential difference

b) Distance travelled

c) Displacement

d) Speed

Correct Answer: a) Electric potential difference

Explanation: Electric potential difference depends only on the initial and final positions because electrostatic forces are conservative.

MCQ No. 244

A neutral metal sphere is brought near a negatively charged rod without touching it. The side nearer the rod becomes:

a) Positively charged

b) Negatively charged

c) Neutral

d) Permanently charged

Correct Answer: a) Positively charged

Explanation: Electrons are repelled to the far side of the sphere, leaving the near side with an induced positive charge.

MCQ No. 245

Why is a lightning conductor made with a sharp pointed end?

a) To reduce resistance.

b) To increase charge density and produce a strong electric field.

c) To increase its mass.

d) To reduce the Earth's potential.

Correct Answer: b) To increase charge density and produce a strong electric field.

Explanation: Charge accumulates more readily at sharp points, creating a stronger electric field that helps safely discharge excess charge into the atmosphere and Earth.

MCQ No. 246

A positively charged particle released in a uniform electric field will move:

a) Opposite to the field direction.

b) Perpendicular to the field.

c) In the direction of the electric field.

d) In a circular path.

Correct Answer: c) In the direction of the electric field.

Explanation: A positive charge experiences a force in the same direction as the electric field.

MCQ No. 247

Which property of electrostatic force allows electric potential to be defined uniquely?

a) It is a contact force.

b) It is conservative.

c) It is always attractive.

d) It depends only on mass.

Correct Answer: b) It is conservative.

Explanation: Because electrostatic force is conservative, the work done depends only on the initial and final positions, making electric potential well defined.

MCQ No. 248

An electric dipole is placed in a uniform electric field. The field exerts:

a) Only a net force.

b) Only a torque (when the dipole is not aligned with the field).

c) Neither force nor torque.

d) An infinite force.

Correct Answer: b) Only a torque (when the dipole is not aligned with the field).

Explanation: In a uniform electric field, the equal and opposite forces on the dipole cancel, producing no net force but a torque that tends to align the dipole with the field.

MCQ No. 249

Which statement correctly explains electrostatic induction?

a) Charges are transferred by direct contact.

b) Charges are redistributed without physical contact.

c) Charges are created inside the conductor.

d) Electric current continuously flows through the conductor.

Correct Answer: b) Charges are redistributed without physical contact.

Explanation: In electrostatic induction, the presence of a nearby charged object causes the free charges in a conductor to rearrange without touching it.

MCQ No. 250

A student claims that "If the electric field at a point is zero, then the electric potential must also be zero." This statement is:

a) Always true.

b) Always false because potential can have any constant value where the electric field is zero.

c) True only for positive charges.

d) True only inside conductors.

Correct Answer: b) Always false because potential can have any constant value where the electric field is zero.

Explanation: Electric field is related to the rate of change of potential, not the value of the potential itself. Therefore, a point may have zero electric field while the electric potential is positive, negative, or zero, depending on the surrounding charge distribution.

(MCQs 251–275)

Coverage: Advanced Multi-Concept Analysis, Electrostatic Equilibrium, Conductors, Capacitors, Electric Fields, Potential, Gauss's Law, and Real-Life Applications.

MCQ No. 251

Two identical positively charged spheres are brought close to each other without touching. The electric force between them will:

a) Become attractive

b) Become zero

c) Remain repulsive

d) Change into gravitational force

Correct Answer: c) Remain repulsive

Explanation: Since both spheres carry positive charges, the electrostatic force between them remains repulsive regardless of the distance, although its magnitude changes according to Coulomb's law.

MCQ No. 252

A charged particle is released from rest in a uniform electric field. As it moves, its electric potential energy decreases while its:

a) Mass increases

b) Kinetic energy increases

c) Charge increases

d) Electric field disappears

Correct Answer: b) Kinetic energy increases

Explanation: The decrease in electric potential energy is converted into kinetic energy, conserving the total mechanical energy.

MCQ No. 253

A hollow conducting sphere carries excess charge. Which statement is true?

a) Charge is uniformly distributed throughout its volume.

b) Charge remains only on the outer surface.

c) Charge remains only inside the cavity.

d) Charge collects at the centre.

Correct Answer: b) Charge remains only on the outer surface.

Explanation: In electrostatic equilibrium, all excess charge resides on the outer surface of a conductor, making the electric field inside the conducting material zero.

MCQ No. 254

A positive charge is moved from point A to point B along two different paths. The work done by the electrostatic force is:

a) Greater for the longer path

b) Greater for the shorter path

c) The same for both paths

d) Zero for only one path

Correct Answer: c) The same for both paths

Explanation: Electrostatic force is conservative; therefore, the work done depends only on the initial and final positions, not on the path taken.

MCQ No. 255

A charged conductor is in electrostatic equilibrium. Which statement is correct?

a) Electric field is maximum inside the conductor.

b) Electric potential is the same at every point of the conductor.

c) Electric field is parallel to the surface.

d) Charges continuously move inside the conductor.

Correct Answer: b) Electric potential is the same at every point of the conductor.

Explanation: A conductor in electrostatic equilibrium is an equipotential body with zero electric field inside it.

MCQ No. 256

Two charges are separated by a distance $r$ . If each charge is tripled while the distance remains unchanged, the electrostatic force becomes:

a) Three times

b) Six times

c) Nine times

d) Twenty-seven times

Correct Answer: c) Nine times

Explanation:

Since

F\propto q_1q_2,

tripling both charges increases the product by

3\times3=9.

MCQ No. 257

An electron is released in a uniform electric field directed east. The electron initially accelerates:

a) East

b) West

c) North

d) South

Correct Answer: b) West

Explanation: The electron has a negative charge, so the electric force acts opposite to the direction of the electric field.

MCQ No. 258

Which statement correctly explains why electric field lines are closer together near sharp edges of a conductor?

a) Electric potential is zero there.

b) Surface charge density is greater at sharp edges.

c) Electric current is larger there.

d) The conductor becomes polarized.

Correct Answer: b) Surface charge density is greater at sharp edges.

Explanation: A smaller radius of curvature results in a higher surface charge density and, consequently, a stronger electric field.

MCQ No. 259

A capacitor is disconnected from the battery after being fully charged. If the plate separation is increased, the stored charge:

a) Increases

b) Decreases

c) Remains constant

d) Becomes zero

Correct Answer: c) Remains constant

Explanation: Once disconnected from the battery, the capacitor is isolated. Therefore, no charge can enter or leave the plates.

MCQ No. 260

Why is electric potential constant throughout the interior of a conductor?

a) Electric field inside is zero.

b) Charges are absent.

c) Resistance is zero.

d) Potential depends only on temperature.

Correct Answer: a) Electric field inside is zero.

Explanation: Since the electric field is zero inside a conductor in electrostatic equilibrium, no potential difference exists between any two interior points.

MCQ No. 261

A Gaussian surface encloses equal positive and negative charges. The net electric flux through the surface is:

a) Positive

b) Negative

c) Zero

d) Infinite

Correct Answer: c) Zero

Explanation: The algebraic sum of the enclosed charges is zero; therefore, Gauss's law gives zero net electric flux.

MCQ No. 262

A positive test charge is placed exactly at the centre of a uniformly charged spherical conducting shell. The net electric force on the test charge due to the shell is:

a) Maximum

b) Zero

c) Directed outward

d) Directed inward

Correct Answer: b) Zero

Explanation: The electric field everywhere inside a charged conducting shell is zero, so the test charge experiences no electrostatic force.

MCQ No. 263

Which statement best describes an equipotential surface?

a) Electric field is parallel to the surface.

b) Electric field is perpendicular to the surface.

c) Electric field is zero everywhere.

d) Electric field is tangent to the surface.

Correct Answer: b) Electric field is perpendicular to the surface.

Explanation: Electric field lines always intersect equipotential surfaces at right angles because no work is done along an equipotential surface.

MCQ No. 264

A lightning conductor protects a building primarily because it:

a) Attracts all clouds.

b) Provides a low-resistance path for electric discharge to Earth.

c) Stops lightning from forming.

d) Stores atmospheric charge.

Correct Answer: b) Provides a low-resistance path for electric discharge to Earth.

Explanation: The conductor safely carries large electric currents from lightning into the ground, minimizing damage to the structure.

MCQ No. 265

A dielectric increases the capacitance of a capacitor because it:

a) Increases plate separation.

b) Reduces the effective electric field between the plates.

c) Removes charge from the plates.

d) Increases resistance.

Correct Answer: b) Reduces the effective electric field between the plates.

Explanation: Polarization of the dielectric reduces the internal electric field, allowing more charge to be stored at the same applied voltage.

MCQ No. 266

Which statement correctly compares Coulomb's law and Newton's law of gravitation?

a) Both forces are always attractive.

b) Both obey the inverse-square law.

c) Both depend on electric charge.

d) Both act only over short distances.

Correct Answer: b) Both obey the inverse-square law.

Explanation: Both laws state that the force varies inversely with the square of the distance between two interacting objects.

MCQ No. 267

A charged particle is moved along an equipotential surface. Which quantity changes?

a) Electric potential

b) Electric potential energy

c) Work done by electrostatic force

d) None of the above

Correct Answer: d) None of the above

Explanation: Along an equipotential surface, the potential difference is zero. Therefore, no work is done, and the electric potential energy remains unchanged.

MCQ No. 268

The electric field at the centre of a uniformly charged conducting spherical shell is:

a) Maximum

b) Minimum but not zero

c) Zero

d) Infinite

Correct Answer: c) Zero

Explanation: By electrostatic shielding, the electric field inside a conducting shell is zero at every interior point.

MCQ No. 269

A capacitor connected to a battery has a dielectric inserted between its plates. Which quantity increases?

a) Potential difference

b) Charge stored

c) Plate separation

d) Electric field

Correct Answer: b) Charge stored

Explanation: The battery maintains a constant voltage. Since the capacitance increases after inserting the dielectric, additional charge flows onto the plates.

MCQ No. 270

The electric potential due to a point charge becomes one-third of its original value. The distance from the charge has become:

a) One-third

b) Three times

c) Nine times

d) Square root of three times

Correct Answer: b) Three times

Explanation: Electric potential varies inversely with distance,

V\propto\frac{1}{r}.

MCQ No. 271

A charged body attracts a neutral conductor mainly because of:

a) Conduction

b) Electrostatic induction

c) Magnetic force

d) Gravitation

Correct Answer: b) Electrostatic induction

Explanation: The charged body redistributes charges within the neutral conductor, creating an attractive force.

MCQ No. 272

Which statement about electric flux is correct?

a) It depends only on the electric field.

b) It depends only on the enclosed charge for a closed surface.

c) It depends on the shape of the Gaussian surface.

d) It depends on the material of the surface.

Correct Answer: b) It depends only on the enclosed charge for a closed surface.

Explanation: According to Gauss's law, the net electric flux through any closed surface depends solely on the total enclosed charge.

MCQ No. 273

The purpose of earthing a conductor is to:

a) Increase its electric field.

b) Maintain it at Earth's potential by allowing charge transfer.

c) Increase its resistance.

d) Make it an insulator.

Correct Answer: b) Maintain it at Earth's potential by allowing charge transfer.

Explanation: Earthing allows electrons to flow to or from the Earth until the conductor reaches zero potential relative to Earth.

MCQ No. 274

Which quantity is always directed from higher potential to lower potential?

a) Electric charge

b) Electric field

c) Electric current

d) Electric flux

Correct Answer: b) Electric field

Explanation: The electric field points in the direction of decreasing electric potential.

MCQ No. 275

A student states:

Statement I: Electric field inside a conductor is zero in electrostatic equilibrium.

Statement II: Therefore, the conductor is an equipotential body.

Which option is correct?

a) Both statements are true, and Statement II is the correct explanation of Statement I.

b) Both statements are true, but Statement II is not the correct explanation of Statement I.

c) Statement I is true, and Statement II is false.

d) Both statements are false.

Correct Answer: b) Both statements are true, but Statement II is not the correct explanation of Statement I.

Explanation: In electrostatic equilibrium, the electric field inside a conductor becomes zero because free charges redistribute themselves. As a consequence, there is no potential difference within the conductor, making it an equipotential body. Thus, both statements are true, but the equipotential nature is a result of the zero electric field, not its cause.

(MCQs 276–300)

Coverage: Comprehensive HOTS, Assertion–Reason, Multi-Concept Analysis, Real-Life Applications, Conductors, Capacitors, Electric Fields, Electric Potential, and Gauss's Law.

MCQ No. 276

Two identical metallic spheres carry charges of +8 μC and –2 μC respectively. They are brought into contact and then separated. The final charge on each sphere will be:

a) +2 μC

b) +3 μC

c) +4 μC

d) +6 μC

Correct Answer: b) +3 μC

Explanation:

Total charge

Q_{total}=+8-2=+6\ \mu C

Since the spheres are identical, the total charge is shared equally.

Q=\frac{6}{2}=+3\ \mu C

MCQ No. 277

A positively charged particle moves freely in the direction of a uniform electric field. During its motion:

a) Both electric potential and potential energy increase.

b) Electric potential decreases while kinetic energy increases.

c) Electric potential increases while kinetic energy decreases.

d) Electric potential remains constant.

Correct Answer: b) Electric potential decreases while kinetic energy increases.

Explanation: A positive charge naturally moves toward lower electric potential. Its electric potential energy decreases and is converted into kinetic energy.

MCQ No. 278

Which statement best explains why Coulomb's law obeys the principle of superposition?

a) Electric forces are independent and add vectorially.

b) Charges disappear after interaction.

c) Electric fields cancel completely.

d) Potential is always zero.

Correct Answer: a) Electric forces are independent and add vectorially.

Explanation: The net electrostatic force on a charge is the vector sum of the forces produced independently by all other charges.

MCQ No. 279

A hollow conductor contains a small charged particle suspended exactly at its centre without touching the conductor. The induced charge on the inner surface of the conductor is:

a) Zero

b) Equal and opposite to the enclosed charge

c) Equal to the enclosed charge

d) Twice the enclosed charge

Correct Answer: b) Equal and opposite to the enclosed charge

Explanation: According to Gauss's law, an equal and opposite induced charge appears on the inner surface so that the electric field inside the conducting material remains zero.

MCQ No. 280

A capacitor is charged and disconnected from the battery. If the plate area is increased without changing the stored charge, the potential difference across the capacitor will:

a) Increase

b) Decrease

c) Remain constant

d) Become zero

Correct Answer: b) Decrease

Explanation: Increasing the plate area increases the capacitance. Since

V=\frac{Q}{C},

and $Q$ remains constant, the potential difference decreases.

MCQ No. 281

An electric field exists in a region, but the electric potential is the same at two nearby points. This is possible only if the displacement between the points is:

a) Along the electric field

b) Opposite to the electric field

c) Perpendicular to the electric field

d) Radially outward

Correct Answer: c) Perpendicular to the electric field

Explanation: The electric field is always perpendicular to an equipotential surface. Therefore, moving along the surface requires no work.

MCQ No. 282

A positively charged rod is brought near an isolated neutral conductor. Which statement is correct?

a) Total charge of the conductor increases.

b) Total charge becomes positive.

c) Charges redistribute but total charge remains unchanged.

d) Electrons leave the conductor permanently.

Correct Answer: c) Charges redistribute but total charge remains unchanged.

Explanation: Electrostatic induction only redistributes charges inside the conductor; it does not change the total charge.

MCQ No. 283

A Gaussian surface encloses three charges: +5 μC, −8 μC, and +7 μC. The electric flux depends on:

a) +12 μC

b) +4 μC

c) −4 μC

d) +5 μC

Correct Answer: b) +4 μC

Explanation:

Net enclosed charge

Q=(+5-8+7)=+4\ \mu C

According to Gauss's law,

\Phi=\frac{Q}{\varepsilon_0}.

MCQ No. 284

Which property of conductors makes electrostatic shielding possible?

a) High resistance

b) Presence of free electrons

c) High density

d) Large mass

Correct Answer: b) Presence of free electrons

Explanation: Free electrons redistribute themselves until the electric field inside the conductor becomes zero.

MCQ No. 285

A student says, "Electric field lines always start from positive charges." Which statement is most accurate?

a) Always true.

b) They may also begin at infinity and end on negative charges.

c) They always form closed loops.

d) They originate from conductors only.

Correct Answer: b) They may also begin at infinity and end on negative charges.

Explanation: Electric field lines originate on positive charges or at infinity and terminate on negative charges or at infinity.

MCQ No. 286

Two identical capacitors are connected in series across a battery. Compared with a single capacitor connected to the same battery, the equivalent capacitance is:

a) Twice

b) Half

c) Four times

d) Unchanged

Correct Answer: b) Half

Explanation: For two identical capacitors,

C_{eq}=\frac{C}{2}.

MCQ No. 287

The electric potential at infinity is usually taken as zero because:

a) There is no electric field anywhere.

b) It provides a convenient reference level.

c) Potential is always zero there physically.

d) Charges disappear at infinity.

Correct Answer: b) It provides a convenient reference level.

Explanation: Electric potential is defined relative to a reference point. Infinity is chosen by convention for isolated charge distributions.

MCQ No. 288

A negatively charged particle released in a uniform electric field moves toward:

a) Higher electric potential

b) Lower electric potential

c) Zero electric field only

d) An equipotential surface

Correct Answer: a) Higher electric potential

Explanation: A negative charge moves opposite to the electric field, which corresponds to moving toward higher electric potential.

MCQ No. 289

A conductor in electrostatic equilibrium has:

a) Zero electric potential

b) Constant electric potential

c) Infinite electric potential

d) Negative electric potential only

Correct Answer: b) Constant electric potential

Explanation: Every point on a conductor in electrostatic equilibrium has the same electric potential, although its value need not be zero.

MCQ No. 290

A capacitor stores energy because:

a) Charge accumulates inside the dielectric.

b) Energy is stored in the electric field between the plates.

c) Energy is stored in the conducting plates only.

d) The battery permanently stores energy inside it.

Correct Answer: b) Energy is stored in the electric field between the plates.

Explanation: The electric field established between the capacitor plates stores electrical potential energy.

MCQ No. 291

A charge is moved along an equipotential surface. Which statement is correct?

a) Electric field performs maximum work.

b) Electric field performs no work.

c) Electric potential changes continuously.

d) Kinetic energy always increases.

Correct Answer: b) Electric field performs no work.

Explanation: Since the potential difference is zero,

W=q\Delta V=0.

MCQ No. 292

Which of the following devices mainly relies on electrostatic induction?

a) Electric motor

b) Electroscope

c) Transformer

d) Generator

Correct Answer: b) Electroscope

Explanation: A gold-leaf electroscope detects electric charge through electrostatic induction and charge redistribution.

MCQ No. 293

A conductor is connected to Earth while a positively charged rod is held nearby. After disconnecting the Earth first and then removing the rod, the conductor becomes:

a) Positively charged

b) Negatively charged

c) Neutral

d) Alternately positive and negative

Correct Answer: b) Negatively charged

Explanation: Electrons flow from Earth onto the conductor while the positive rod is nearby. After the grounding connection is removed, these extra electrons remain on the conductor.

MCQ No. 294

The SI unit of electric flux is:

a) N/C

b) V/m

c) N·m²/C

d) C·m

Correct Answer: c) N·m²/C

Explanation: Electric flux is the product of electric field and area.

MCQ No. 295

The direction of the electric field at any point is:

a) Along the tangent to the electric field line.

b) Perpendicular to the electric field line.

c) Opposite to the force on a positive charge.

d) Undefined.

Correct Answer: a) Along the tangent to the electric field line.

Explanation: The electric field at a point is always tangent to the electric field line passing through that point.

MCQ No. 296

If all distances in Coulomb's law are doubled while the charges remain unchanged, the electrostatic force becomes:

a) Double

b) Half

c) One-fourth

d) One-eighth

Correct Answer: c) One-fourth

Explanation: Since

F\propto\frac{1}{r^2},

doubling the distance reduces the force by a factor of four.

MCQ No. 297

A charged conductor has the greatest surface charge density at:

a) Flat surfaces

b) Regions with the smallest radius of curvature

c) The centre of the conductor

d) Every point equally

Correct Answer: b) Regions with the smallest radius of curvature

Explanation: Sharp points have a small radius of curvature, resulting in greater surface charge density and a stronger electric field.

MCQ No. 298

Which statement correctly explains why electrostatic force is called a central force?

a) It acts only at the centre of Earth.

b) It always acts along the line joining the two interacting charges.

c) It depends only on electric potential.

d) It acts only on conductors.

Correct Answer: b) It always acts along the line joining the two interacting charges.

Explanation: Coulomb's force acts along the straight line joining the centers of the two point charges.

MCQ No. 299

Assertion (A): Electric potential is constant throughout a conductor in electrostatic equilibrium.

Reason (R): Electric field inside the conductor is zero.

a) Both A and R are true, and R is the correct explanation of A.

b) Both A and R are true, but R is not the correct explanation of A.

c) A is true, but R is false.

d) A is false, but R is true.

Correct Answer: a) Both A and R are true, and R is the correct explanation of A.

Explanation: Since the electric field inside a conductor is zero, there is no potential difference between any two interior points. Therefore, the conductor remains at a constant potential.

MCQ No. 300

A physics student summarizes electrostatics with the following statements:

I. Electric charges produce electric fields.

II. Electric fields exert forces on other charges.

III. Electrostatic forces are conservative.

IV. Gauss's law relates electric flux to enclosed charge.

Which option is correct?

a) Only I and II are correct.

b) Only I, II, and III are correct.

c) Only II, III, and IV are correct.

d) All four statements are correct.

Correct Answer: d) All four statements are correct.

Explanation: These four statements summarize the fundamental principles of electrostatics. Electric charges create electric fields, electric fields exert forces on charges, electrostatic forces are conservative, and Gauss's law relates the net electric flux through a closed surface to the net enclosed charge.

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Electrostatics – 100 Higher-Order Thinking (HOTS) MCQs with Explanations | Competitive Exam Preparation

50 Higher-Order Thinking Skills (HOTS) MCQs (Level 3) on Fluid Dynamics, Physics (Unit-Wise MCQs Practice):

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Electrostatics (Level 3) – 100 Higher-Order Thinking (HOTS) MCQs with Explanations

(MCQs 101–200)

(MCQs 201–225)

MCQ No. 201

MCQ No. 202

MCQ No. 203

MCQ No. 204

MCQ No. 205

MCQ No. 206

MCQ No. 207

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MCQ No. 225

(MCQs 226–250)

MCQ No. 226

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(MCQs 251–275)

MCQ No. 251

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MCQ No. 256

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MCQ No. 264

MCQ No. 265

MCQ No. 266

MCQ No. 267

MCQ No. 268

MCQ No. 269

MCQ No. 270

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