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Free download in PDF Electromagnetic Induction Short Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like IIT-JEE, AIIMS etc. These short solved questions or quizzes are provided by Gkseries.
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)
43
Which of the following is unit of inductance ?
[A]
Ohm
[B]
Henry
[C]
Ampere turns
[D]
Webers/metre
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
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
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
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
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
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
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