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Electromagnetic MCQs | Electromagnetic Induction Short Questions and Answers

Questions
41 Which of the following is not a unit of inductance ?
A Henry
B Coulomb/volt ampere
C Volt second per ampere
D All of the above

Answer: Coulomb/volt ampere
42 In case of an inductance, current is proportional to
A voltage across the inductance
B magnetic field
C both (a) and (b)
D neither (a) nor (b)

Answer: magnetic field
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43 Which of the following is unit of inductance ?
A Ohm
B Henry
C Ampere turns
D Webers/metre

Answer: Henry
44 The self inductances of two coils are 8 mH and 18 mH. If the co-efficients of coupling is 0.5, the mutual inductance of the coils is
A 4 mH
B 5 mH
C 6 mH
D None of the above

Answer: 6 mH
45 A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be
A 6 mH
B 14 mH
C 48 mH
D All of the above

Answer: 48 mH
46 Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be
A 6 H
B 8 H
C 12 H
D 24 H

Answer: 12 H
47 A conductor 2 meters long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be
A 10 V
B 15 V
C 25V
D 50V

Answer: 25V
48 A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage ?
A 0.01 s
B 0.1 s
C 0.5 s
D None of these

Answer: 0.5 s
49 An open coil has
A zero resistance and inductance
B infinite resistance and zero inductance
C infinite resistance and normal inductance
D zero resistance and high inductance

Answer: infinite resistance and zero inductance
50 Lenz’s law is a consequence of the law of conservation of
A induced current
B charge
C energy
D None Of The Above

Answer: energy

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