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

50 Higher-Order Thinking Skills (HOTS) MCQs (Level 3) on Electromagnetism, 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 exams (MDCAT, ECAT, NUST, PIEAS, GIKI, UET, FAST, and other engineering or medical admission tests), this comprehensive MCQ collection is designed to help you master Electromagnetism. The questions are arranged progressively—from basic concepts to advanced numerical problems and higher-order thinking—ensuring complete and systematic preparation for every type of examination.

This chapter-wise MCQ collection includes:

• 100 Basic MCQs Level-1 (1–100) – Covering magnetic fields, magnetic force, magnetic flux, Ampere's law, solenoids, galvanometers, transformers, alternating current, and other fundamental concepts.
• 100 Advanced & Numerical MCQs (101–200) – Focusing on formulas, calculations, magnetic fields, force on charges, transformer problems, AC circuits, inductance, and practical applications.
• 50 Higher-Order Thinking Skills (HOTS) MCQs (201–250) – Designed to strengthen analytical reasoning, conceptual understanding, and advanced problem-solving skills.
• 50 Challenging MCQs Quiz with Answers – A carefully selected mix of conceptual, numerical, and HOTS questions for quick revision and self-assessment.

This MCQ collection covers:

• Magnetic fields and magnetic force
• Magnetic flux and Ampere's Law
• Solenoids and current-carrying conductors
• Motion of charged particles in magnetic fields
• Velocity selector and cyclotron
• Torque on current loops and magnetic dipoles
• Galvanometer, ammeter, voltmeter, and multimeter
• Electromagnetic induction and Lenz's Law
• Self and mutual inductance
• Transformers and alternating current (AC)
• Reactance, impedance, resonance, and power factor
• Electromagnetic waves and Maxwell's theory
• Practical applications and measurement techniques

Every MCQ includes the correct answer with a clear, concept-based explanation to strengthen understanding, improve problem-solving skills, and reinforce key physics concepts.

This question bank helps students to:

• Build a strong conceptual foundation
• Improve numerical and analytical skills
• Master electromagnetism formulas and applications
• Avoid common examination mistakes
• Increase speed, accuracy, and confidence
• Prepare effectively for both board and competitive examinations

With 250 carefully selected MCQs arranged into 100 Basic, 100 Advanced & Numerical, and 50 HOTS MCQs, this all-in-one question bank provides complete preparation for Electromagnetism, making it an excellent resource for achieving success in both board examinations and competitive entrance tests.

---

Best Budget Laptops for Students for Study, Coding & Office Work 
(2026 Amazon Deals)

👉 Check Today’s Price on Amazon👈

👉 Check Acer Aspire 5 Price on Amazon

👉 Buy Lenovo IdeaPad Slim 3 on Amazon

👉 See HP Pavilion Latest Deal on Amazon

👉 View ASUS Vivobook 16 Details on Amazon

👉 Check MacBook Air Student Price on Amazon

---

Electromagnetism MCQs Level 3 – 100 Higher-Order Thinking (HOTS) MCQs (201–300)

---

MCQ No. 201

A charged particle enters a uniform magnetic field at an angle of 30° with the field. The particle will move in:

a. A straight line

b. A circular path

c. A helical path

d. A parabolic path

Correct answer: c

Explanation:
The component of velocity parallel to the magnetic field remains unchanged, while the perpendicular component causes circular motion. The combination of these two motions produces a helical path.

---

MCQ No. 202

Two identical circular coils carry equal currents. If the number of turns in one coil is doubled while the current remains unchanged, the magnetic field at its center will become:

a. Half

b. Double

c. Four times

d. Unchanged

Correct answer: b

Explanation:
The magnetic field at the center of a circular coil is directly proportional to the number of turns (B ∝ N). Therefore, doubling the turns doubles the magnetic field.

---

MCQ No. 203

A charged particle enters a magnetic field with velocity parallel to the field. Which statement is correct?

a. It moves in a circle.

b. It accelerates continuously.

c. It continues in a straight line with constant speed.

d. It comes to rest.

Correct answer: c

Explanation:
When velocity is parallel to the magnetic field, the magnetic force is zero because sin 0° = 0. Therefore, the particle continues with constant velocity.

---

MCQ No. 204

A transformer is connected to a DC supply instead of an AC supply. What will happen?

a. It works normally.

b. Output voltage becomes larger.

c. It produces no induced emf after the initial instant.

d. Frequency increases.

Correct answer: c

Explanation:
A transformer requires a continuously changing magnetic flux. DC provides constant current after switching on, so no continuous induced emf is produced.

---

MCQ No. 205

A coil is rotated in a magnetic field at twice its original angular speed. The maximum induced emf becomes:

a. Half

b. Same

c. Double

d. Four times

Correct answer: c

Explanation:
The peak induced emf is directly proportional to angular speed:

$$E_0 = NBA\omega$$

Doubling ω doubles the induced emf.

---

MCQ No. 206

A moving electron enters a magnetic field. Which quantity always remains constant?

a. Direction of velocity

b. Speed

c. Momentum direction

d. Acceleration

Correct answer: b

Explanation:
A magnetic force is always perpendicular to the velocity, so it changes only the direction of motion and not the speed.

---

MCQ No. 207

A step-up transformer increases voltage from 220 V to 2200 V. Assuming an ideal transformer, the secondary current is:

a. Ten times the primary current

b. Half the primary current

c. One-tenth of the primary current

d. Equal to the primary current

Correct answer: c

Explanation:
In an ideal transformer,

$$V_pI_p=V_sI_s$$

Since voltage increases ten times, current decreases ten times.

---

MCQ No. 208

If both the current and the number of turns of a solenoid are doubled, the magnetic field inside the solenoid becomes:

a. Double

b. Four times

c. Eight times

d. Same

Correct answer: b

Explanation:

$$B=\mu_0 nI$$

Both n and I double.

$$2\times2=4$$

Hence, the magnetic field becomes four times.

---

MCQ No. 209

A conductor moves parallel to magnetic field lines. The induced emf is:

a. Maximum

b. Half

c. Zero

d. Infinite

Correct answer: c

Explanation:
No magnetic field lines are cut when motion is parallel to the field, so no emf is induced.

---

MCQ No. 210

If the frequency of an AC source increases while the inductance remains constant, then the inductive reactance will:

a. Decrease

b. Increase

c. Become zero

d. Remain constant

Correct answer: b

Explanation:

$$X_L=2\pi fL$$

Inductive reactance increases directly with frequency.

---

MCQ No. 211

Why does a magnetic field never change the kinetic energy of a charged particle?

a. It reduces the particle's mass.

b. It acts perpendicular to velocity.

c. It always opposes motion.

d. It removes charge.

Correct answer: b

Explanation:
Since magnetic force is perpendicular to velocity, it performs no work. Therefore, kinetic energy remains unchanged.

---

MCQ No. 212

A current-carrying conductor experiences maximum force when it is placed:

a. Parallel to the magnetic field

b. At 45° to the field

c. Perpendicular to the magnetic field

d. Opposite to the field

Correct answer: c

Explanation:

$$F=BIL\sin\theta$$

Force is maximum when θ = 90°.

---

MCQ No. 213

Two long parallel wires carry equal currents in opposite directions. They will:

a. Attract each other

b. Repel each other

c. Produce no force

d. Rotate together

Correct answer: b

Explanation:
Parallel currents flowing in opposite directions repel each other.

---

MCQ No. 214

If the magnetic flux through a coil remains constant, the induced emf is:

a. Maximum

b. Minimum

c. Zero

d. Infinite

Correct answer: c

Explanation:
According to Faraday's law,

$$e=-\frac{d\Phi}{dt}$$

No change in flux means no induced emf.

---

MCQ No. 215

The negative sign in Faraday's law indicates that induced current:

a. Increases magnetic flux

b. Opposes the change in magnetic flux

c. Is always clockwise

d. Is always anticlockwise

Correct answer: b

Explanation:
This is Lenz's law, which follows the law of conservation of energy.

---

MCQ No. 216

A capacitor is connected to a very high-frequency AC source. It behaves almost like:

a. An open circuit

b. A short circuit

c. A battery

d. An inductor

Correct answer: b

Explanation:
At high frequency,

$$X_C=\frac1{2\pi fC}$$

Reactance becomes very small.

---

MCQ No. 217

Which modification will increase the sensitivity of a moving-coil galvanometer?

a. Decrease the number of turns

b. Increase the magnetic field strength

c. Increase the spring constant

d. Reduce the coil area

Correct answer: b

Explanation:
Greater magnetic field produces greater torque for the same current, increasing sensitivity.

---

MCQ No. 218

The speed of electromagnetic waves depends mainly upon:

a. Their frequency

b. Their wavelength

c. The properties of the medium

d. Their amplitude

Correct answer: c

Explanation:
The speed is

$$v=\frac1{\sqrt{\mu\varepsilon}}$$

which depends on the medium.

---

MCQ No. 219

At resonance in a series RLC circuit, which statement is correct?

a. Current becomes minimum.

b. Impedance becomes maximum.

c. Inductive and capacitive reactances become equal.

d. Voltage becomes zero.

Correct answer: c

Explanation:
At resonance,

$$X_L=X_C$$

The reactances cancel, making impedance minimum.

---

MCQ No. 220

Which material is most suitable for making the core of a transformer?

a. Hard steel

b. Copper

c. Laminated soft iron

d. Aluminium

Correct answer: c

Explanation:
Soft iron has high permeability and low hysteresis loss, while lamination reduces eddy current losses.

---

MCQ No. 221

A magnetic field can change the:

a. Magnitude of velocity only

b. Direction of velocity only

c. Mass of the particle

d. Charge of the particle

Correct answer: b

Explanation:
Magnetic force changes only the direction of motion, not the speed.

---

MCQ No. 222

Why are transformer cores laminated?

a. To increase resistance

b. To reduce eddy current losses

c. To increase voltage

d. To increase frequency

Correct answer: b

Explanation:
Thin insulated sheets prevent large circulating eddy currents.

---

MCQ No. 223

A particle moving in a circular path inside a magnetic field suddenly enters a field of greater strength. The radius of its path will:

a. Increase

b. Remain the same

c. Decrease

d. Become infinite

Correct answer: c

Explanation:

$$r=\frac{mv}{qB}$$

Increasing B decreases the radius.

---

MCQ No. 224

Why is AC preferred over DC for long-distance power transmission?

a. AC has greater speed.

b. AC can easily be stepped up to high voltage, reducing transmission losses.

c. AC always has greater current.

d. AC has lower resistance.

Correct answer: b

Explanation:
High-voltage transmission reduces current and minimizes I²R losses. Transformers make this practical with AC.

---

MCQ No. 225

James Clerk Maxwell's greatest contribution to electromagnetism was:

a. Discovering the electron

b. Explaining electric current

c. Unifying electricity, magnetism, and light into one theory

d. Inventing the electric motor

Correct answer: c

Explanation:
Maxwell's equations unified electricity and magnetism and predicted electromagnetic waves, showing that light itself is an electromagnetic wave.

---

MCQ No. 226

A charged particle enters a uniform magnetic field with a velocity having both parallel and perpendicular components. If the magnetic field strength is doubled while the speed remains constant, what happens to the motion?

a. The radius of the helix doubles.

b. The pitch of the helix doubles.

c. The radius of the helix becomes half, while the pitch also becomes half.

d. The particle moves in a straight line.

Correct answer: c

Explanation:
The radius of the helical path is

$$r=\frac{mv_\perp}{qB}$$

Doubling the magnetic field halves the radius. The time period also becomes half because $T=\frac{2\pi m}{qB}$. Since pitch = $v_\parallel T$, the pitch also becomes half.

---

MCQ No. 227

A transformer is designed to step up voltage by a factor of 20. If the secondary current is 2 A, what is the primary current of an ideal transformer?

a. 0.1 A

b. 2 A

c. 20 A

d. 40 A

Correct answer: d

Explanation:
For an ideal transformer,

$$V_pI_p=V_sI_s$$

Since the voltage increases 20 times, the current decreases 20 times.

$$I_p=20\times2=40A$$

---

MCQ No. 228

A current-carrying conductor is placed first perpendicular and then parallel to a magnetic field. The ratio of magnetic forces is:

a. 0 : 1

b. 1 : 0

c. 1 : 1

d. 2 : 1

Correct answer: b

Explanation:
Magnetic force is

$$F=BIL\sin\theta$$

For 90°, force is maximum; for 0°, force is zero. Hence the ratio is 1 : 0.

---

MCQ No. 229

Two identical solenoids carry equal currents. One has twice the number of turns per unit length as the other. The magnetic field inside it will be:

a. Half

b. Same

c. Double

d. Four times

Correct answer: c

Explanation:
The magnetic field inside a solenoid is

$$B=\mu_0nI$$

Doubling the turns per unit length doubles the magnetic field.

---

MCQ No. 230

A charged particle moves in a circle inside a magnetic field. Which quantity provides the required centripetal force?

a. Electric force

b. Magnetic force

c. Gravitational force

d. Electrostatic force

Correct answer: b

Explanation:
The magnetic force is always perpendicular to the velocity and acts as the centripetal force responsible for circular motion.

---

MCQ No. 231

An ideal transformer transfers electrical energy from one circuit to another without changing:

a. Voltage

b. Current

c. Frequency

d. Number of turns

Correct answer: c

Explanation:
A transformer changes voltage and current but does not change the frequency of the alternating current.

---

MCQ No. 232

A conductor is moved faster across a magnetic field. Which statement is correct?

a. Induced emf decreases.

b. Induced emf remains unchanged.

c. Induced emf increases.

d. Induced current becomes zero.

Correct answer: c

Explanation:
The motional emf is

$$e=BLv$$

Increasing the speed increases the induced emf.

---

MCQ No. 233

An inductor is connected to a DC source. After a long time, the inductor behaves like:

a. An open circuit

b. A capacitor

c. A short circuit

d. A battery

Correct answer: c

Explanation:
After steady current is established, the rate of change of current becomes zero, so the back emf disappears and the ideal inductor behaves like a conducting wire.

---

MCQ No. 234

The main purpose of Lenz's law is to satisfy the law of:

a. Gravitation

b. Conservation of momentum

c. Conservation of energy

d. Coulomb's law

Correct answer: c

Explanation:
Lenz's law ensures that the induced current always opposes the cause producing it, thereby conserving energy.

---

MCQ No. 235

A magnetic field can change all of the following except:

a. Direction of velocity

b. Direction of momentum

c. Kinetic energy

d. Direction of motion

Correct answer: c

Explanation:
A magnetic force performs no work, so the kinetic energy of a charged particle remains constant.

---

MCQ No. 236

At resonance in a series RLC circuit, which quantity becomes maximum?

a. Resistance

b. Current

c. Reactance

d. Inductance

Correct answer: b

Explanation:
At resonance,

$$X_L=X_C$$

The impedance becomes minimum, so the current becomes maximum.

---

MCQ No. 237

If the current in a solenoid is reversed, the magnetic field inside it:

a. Remains unchanged

b. Becomes zero

c. Reverses its direction

d. Doubles

Correct answer: c

Explanation:
The direction of the magnetic field depends on the direction of current.

---

MCQ No. 238

A galvanometer can be converted into both an ammeter and a voltmeter because it is basically a sensitive:

a. Resistance

b. Current detector

c. Power meter

d. Voltage source

Correct answer: b

Explanation:
A galvanometer is designed to detect very small electric currents.

---

MCQ No. 239

The magnetic field due to a long straight conductor becomes half when:

a. Current is doubled

b. Distance from the conductor is doubled

c. Distance is halved

d. Current is quadrupled

Correct answer: b

Explanation:

$$B=\frac{\mu_0I}{2\pi r}$$

Doubling the distance halves the magnetic field.

---

MCQ No. 240

Why is soft iron preferred for transformer cores?

a. It has high resistance.

b. It has low permeability.

c. It has high permeability and low hysteresis loss.

d. It is inexpensive only.

Correct answer: c

Explanation:
Soft iron is easily magnetized and demagnetized, making transformer operation highly efficient.

---

MCQ No. 241

An electromagnetic wave travels from air into glass. Which quantity remains unchanged?

a. Speed

b. Wavelength

c. Frequency

d. Energy density

Correct answer: c

Explanation:
The frequency of a wave remains constant when it passes from one medium to another, while speed and wavelength change.

---

MCQ No. 242

The RMS value of alternating current is used because it represents:

a. Maximum current

b. Average current over half a cycle

c. The equivalent DC value producing the same heating effect

d. Instantaneous current

Correct answer: c

Explanation:
RMS value is the effective value of AC that produces the same heating effect as an equal DC current.

---

MCQ No. 243

Which of the following changes will increase the induced emf in a coil?

a. Increasing the rate of change of magnetic flux

b. Keeping the flux constant

c. Decreasing the number of turns

d. Stopping the motion of the magnet

Correct answer: a

Explanation:
According to Faraday's law,

$$e\propto\frac{d\Phi}{dt}$$

A faster change in magnetic flux produces a larger induced emf.

---

MCQ No. 244

The primary function of a cyclotron is to:

a. Produce electromagnetic waves

b. Accelerate charged particles

c. Measure magnetic fields

d. Detect electric current

Correct answer: b

Explanation:
A cyclotron uses electric and magnetic fields together to accelerate charged particles to high speeds.

---

MCQ No. 245

If the area of a current-carrying loop is doubled while keeping the current and magnetic field constant, the torque on the loop will:

a. Remain unchanged

b. Become half

c. Double

d. Become four times

Correct answer: c

Explanation:

$$\tau = NIAB\sin\theta$$

Torque is directly proportional to the area of the loop.

---

MCQ No. 246

Which statement correctly distinguishes electric and magnetic fields?

a. Magnetic fields act on stationary charges.

b. Electric fields act only on moving charges.

c. Magnetic fields act only on moving charges.

d. Both act only on stationary charges.

Correct answer: c

Explanation:
Electric fields act on both stationary and moving charges, whereas magnetic fields act only on moving charges.

---

MCQ No. 247

A transformer operates efficiently only when the magnetic flux linking the secondary coil is:

a. Constant

b. Zero

c. Continuously changing

d. Independent of current

Correct answer: c

Explanation:
A changing magnetic flux is essential for continuous electromagnetic induction.

---

MCQ No. 248

A charged particle enters a magnetic field and experiences a force. This proves that the particle's velocity has a component:

a. Parallel to the magnetic field

b. Perpendicular to the magnetic field

c. Equal to zero

d. Opposite to the magnetic field

Correct answer: b

Explanation:
A magnetic force exists only when the velocity has a component perpendicular to the magnetic field.

---

MCQ No. 249

Which scientist successfully unified electricity and magnetism into a single theory?

a. Michael Faraday

b. André-Marie Ampère

c. James Clerk Maxwell

d. Nikola Tesla

Correct answer: c

Explanation:
James Clerk Maxwell developed the mathematical theory that unified electricity, magnetism, and electromagnetic waves.

---

MCQ No. 250

A student claims that increasing the magnetic field always increases the speed of a charged particle moving in that field. Which statement is correct?

a. The claim is correct because magnetic force accelerates the particle.

b. The claim is correct only for electrons.

c. The claim is incorrect because the magnetic field changes only the direction of motion, not the speed.

d. The claim is correct only when the field is uniform.

Correct answer: c

Explanation:
A magnetic force is always perpendicular to the velocity of a charged particle. It changes the direction of motion but does no work, so the particle's speed and kinetic energy remain unchanged.

---

📚 Continue Your Physics Preparation

If you found this quiz helpful, explore our complete collection of Physics learning resources.

🔬 Physics MCQs Hub

---

More Study Resources for Students and Teachers

• Computer Science 11th Class Notes (Main Page) 
• Computer Science 12th Class Notes (Main Page) 

************************************

1. English Poems Analysis Hub– A to Z Index (English Poetry) 

(https://poemanalysishub.blogspot.com/p/english-poems-analysis-to-z-index.html)

2. Website for School and College Level Mathematics  

(https://askraremaths.blogspot.com)

3. ASK Rare Class Notes – Study Resources for Students & Teachers 

(https://askrareclassnotes.blogspot.com/)

© 2026 & onwards Academic Skills and Knowledge (ASK)   

Note:  Write me in the comments box below for any query and also Share this information with your classmates and friends.

---

© https://askrareclassnotes.blogspot.com | Learn • Practice • Succeed

---

Best Tools and Supplies for Students and Teachers:

📚 Grammar Books – Improve Writing, Score Higher
🪑 Study Chairs – Sit Comfortably, Study Better
🛋️ Study Desks – Organized Space, Better Learning
💡 Desk Lamps – Bright Light, Better Focus
⌚ Digital Watches– Manage Time, Improve Results
📱 Phone Stands – Hands-Free Learning Made Easy
🎧 Headphones – Focus Better, Learn Without Distractions
⌨️ Wireless Keyboards – Type Faster, Work Smarter
🖱️ Wireless Mouse – Smooth Control, Better Workflow
🖨️ Printers – Print Smart, Save Time

Disclosure: The above links on this page are affiliate links. This means that if you make a purchase through them, I may earn a small commission at no additional cost to you. Your support helps me maintain, improve, and continue providing valuable free content on this website.

With Best Regards

ASKRare Team

---

---

🌍📖

"Knowledge grows when it is shared."

At ASK Rare Class Notes, we believe quality education should be freely accessible to everyone. Learn, share, inspire, and help others succeed.