Class 12 Physics MCQ Chapter 6 Electromagnetic Induction
Get ahead in your exam preparation with our Class 12 Physics MCQ Chapter 6 Electromagnetic Induction English Medium study resource. This article offers a comprehensive collection of important multiple-choice questions (MCQs) with answers, carefully selected for AHSEC Higher Secondary students.
Electromagnetic Induction is a fundamental chapter in Physics that explains how electricity can be generated from changing magnetic fields. Students will study key topics such as electromagnetic induction, magnetic flux, Faraday’s laws of induction, Lenz’s law, induced electromotive force (EMF), eddy currents, self-induction, mutual induction, and inductors. These concepts are not only important for board examinations but also form the foundation of many real-world electrical and electronic applications.
The MCQs included in this article follow the latest AHSEC syllabus and examination pattern, ensuring that students practice relevant and exam-focused questions. Regular practice will help improve conceptual understanding, enhance numerical-solving abilities, and develop confidence in answering objective-type questions accurately.
Whether you are revising before a test or preparing for the AHSEC Higher Secondary Final Examination, these Chapter 6 MCQ solutions will help you master important concepts and maximize your Physics scores.
Part: I
Electromagnetic Induction
VSA & MCQ
I. Very Short Answer Questions
Q. What is electromagnetic induction?
Ans: It is the phenomenon of production of emf due to change in magnetic flux.
Q. What is magnetic flux?
Ans: Magnetic flux is the product of magnetic field and area, Φ = B · A cosθ.
Q. What is the SI unit of magnetic flux?
Ans: Weber (Wb).
Q. State Faraday’s first law.
Ans: Change in magnetic flux induces emf.
Q. State Faraday’s second law.
Ans: Induced emf is proportional to rate of change of flux, ε = − dΦ / dt.
Q. What does negative sign indicate in Faraday’s law?
Ans: It indicates Lenz’s law.
Q. State Lenz’s law.
Ans: Induced current opposes the cause producing it.
Q. What is induced emf?
Ans: Emf produced due to changing magnetic flux.
Q. What is self-induction?
Ans: Induction of emf in the same coil.
Q. What is mutual induction?
Ans: Induction of emf in a nearby coil.
Q. What is self-inductance?
Ans: L = Φ / I.
Q. What is the SI unit of inductance?
Ans: Henry (H).
Q. What is energy stored in inductor?
Ans: U = (1/2)LI².
Q. What is motional emf?
Ans: Emf due to motion in magnetic field.
Q. Write expression for motional emf.
Ans: ε = Blv.
Q. What is eddy current?
Ans: Circulating currents in conductors.
Q. What is Fleming’s right-hand rule?
Ans: Gives direction of induced current.
Q. What is AC generator?
Ans: Device converting mechanical energy into electrical energy.
Q. What is the principle of generator?
Ans: Electromagnetic induction.
Q. What is inductive reactance?
Ans: X_L = ωL.
Q. What is time constant?
Ans: τ = L / R.
Q. What is back emf?
Ans: Emf opposing applied voltage.
Q. What is magnetic flux linkage?
Ans: NΦ.
Q. What happens if flux is constant?
Ans: No emf is induced.
Q. What is direction of induced current?
Ans: Given by Lenz’s law.
Q. What is transformer principle?
Ans: Mutual induction.
Q. What is step-up transformer?
Ans: Increases voltage.
Q. What is step-down transformer?
Ans: Decreases voltage.
Q. What is induced current unit?
Ans: Ampere.
Q. What is magnetic field change effect?
Ans: Produces emf.
II. Multiple Choice Questions
Q. Unit of magnetic flux is:
(a) Tesla
(b) Weber
(c) Henry
(d) Volt
Ans: (b)
Q. Faraday law relates:
(a) Flux and emf
(b) Voltage and current
(c) Resistance
(d) Power
Ans: (a)
Q. Negative sign in Faraday law indicates:
(a) Energy
(b) Lenz law
(c) Power
(d) Charge
Ans: (b)
Q. Unit of inductance is:
(a) Henry
(b) Tesla
(c) Volt
(d) Ampere
Ans: (a)
Q. Motional emf is:
(a) Blv
(b) IR
(c) V/I
(d) I²R
Ans: (a)
Q. Eddy currents cause:
(a) Heating
(b) Cooling
(c) No effect
(d) Voltage
Ans: (a)
Q. Generator works on:
(a) Induction
(b) Resistance
(c) Capacitance
(d) Charge
Ans: (a)
Q. Transformer uses:
(a) Self induction
(b) Mutual induction
(c) Resistance
(d) Capacitance
Ans: (b)
Q. Induced emf is zero when:
(a) Flux changes
(b) Flux constant
(c) Motion
(d) Field present
Ans: (b)
Q. Time constant depends on:
(a) L and R
(b) V and I
(c) P and R
(d) None
Ans: (a)
Q. Assertion: Induced emf opposes change. Reason: Lenz law.
(a) Both true, reason correct
(b) Both true, reason incorrect
(c) Assertion true, reason false
(d) Both false
Ans: (a)
Q. Assertion: No flux change gives no emf. Reason: Faraday law.
(a) Both true, reason correct
(b) Both true, reason incorrect
(c) Assertion true, reason false
(d) Both false
Ans: (a)
Q. Assertion: Eddy currents cause heating. Reason: Energy loss.
(a) Both true, reason correct
(b) Both true, reason incorrect
(c) Assertion true, reason false
(d) Both false
Ans: (a)
Q. Assertion: Transformer works on DC. Reason: Needs constant flux.
(a) Both true
(b) Both false
(c) Assertion true, reason false
(d) Assertion false, reason true
Ans: (b)
Q. Assertion: Self-induction occurs in same coil. Reason: Changing current.
(a) Both true, reason correct
(b) Both true, reason incorrect
(c) Assertion true, reason false
(d) Both false
Ans: (a)
Q. Assertion: Motional emf needs motion. Reason: Charge moves in field.
(a) Both true, reason correct
(b) Both true, reason incorrect
(c) Assertion true, reason false
(d) Both false
Ans: (a)
Q. Assertion: Energy stored in inductor is magnetic. Reason: Current produces field.
(a) Both true, reason correct
(b) Both true, reason incorrect
(c) Assertion true, reason false
(d) Both false
Ans: (a)
