Bihar Board - Class 12 Physics - Chapter 6: Electromagnetic Induction Multiple Choice Questions (MCQs)
For Class 12 Bihar Board, the chapter Electromagnetic Induction in Physics explains how a changing magnetic field induces an electric current, focusing on Faraday's Law, Lenz's Law, and eddy currents. You can find multiple-choice questions that help in mastering these topics and preparing effectively for exams on Vidyakul.
Multiple Choice Question
1. The relative motion between the magnet and the coil that is responsible for generation of
(A) Magnetic field in the coil
(B) Current in the coil
(C) Voltage in the coil
(D) None
Answer: (B) current in the coil
2. Magnetic flux is the
(A) Vector quantity
(B) Scalar quantity
(C) Tensor quantity
(D) None
Answer: (B) scalar quantity
3. The SI unit of magnetic flux is
(A) Weber
(B) Tm
(C) Tesla
(D) Both (A) and (B)
Answer: (A) Weber
4. The magnitude of the induced emf in a circuit is equal to the time rate of change of ____ through the coil.
(A) Magnetic moment
(B) Magnetic field
(C) Magnetic susceptibility
(D) Magnetic flux
Answer: (D) magnetic flux
5. The Magnitude of the induced emf in a coil is directly proportional to the rate of change of flux linkages. This is known as
(A) Lenz’s law
(B) Faraday's second law of electromagnetic Induction
(C) Both (A) and (B)
(D) Gauss’s law
Answer: (B) Faraday's second law of electromagnetic Induction
6. The polarity not induced emf is such that it tends to produce a current which opposes the change in magnetic flux that produced it, this is
(A) Faraday’s law of electromagnetic induction
(B) Lenz’s law
(C) Both (A) and (B)
(D) None
Answer: (B) Lenz’s law
7. The induced emf Blv is called as
(A) Rotational emf
(B) Motional emf
(C) Magnetic emf
(D) Induced emf
Answer: (B) motional emf
8. Which of the following statements is correct regarding the eddy current?
(A) Magnetic braking in trains
(B) Eddy currents are undesirable in all applications
(C) Eddy currents are desirable in all applications
(D) Eddy currents are desirable in some applications
Answer: (D) Eddy currents are desirable in some applications
9. Inductance is the
(A) Scalar quantity
(B) Vector quantity
(C) Both (A) and (B)
(D) None
Answer: (A) scalar quantity
10. The dimensions of inductance are
(A) [M L2T-2A-2]
(B) [M L-2 T-2A-2]
(C) [M LT-2 A-2]
(D) None
Answer: (B) [M L-2 T-2A-2]
11. The SI unit of inductance is
(A) Ohm
(B) Farad
(C) Henry
(D) Weber
Answer: (C) Henry
12. The production of induced emf in a single coil due to change of flux through the coil by means of varying current through the same coil, this is called as
(A) Mutual induction
(B) Self induction
(C) Both (A) and (B)
(D) None
Answer: (B) self induction
13. Self induction is also called ________.
(A) Back e.m.f.
(B) Coefficient of mutual induction of coil
(C) Self induction
(D) None
Answer: (A) Back e.m.f.
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