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Electromagnetic induction

Electromagnetic induction
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

25 V
12 V
15 V
10 V

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Electromagnetic induction
The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be

12 mH
48 mH
24 mH
3 mH

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Electromagnetic induction
An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is

0.02 wb
0.2 wb
2 wb
20 wb

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Electromagnetic induction
Mutually inductance between two magnetically coupled coils depends on

The number of their turns
All of the listed here
Permeability of the core
Cross-sectional area of their common core

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Electromagnetic induction
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?

None of the listed here
0.5 s
0.2 s
0.1 s

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Electromagnetic induction
A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is

5000 ohms
100 ohms
1000 ohms
500 ohms

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MORE MCQ ON Electromagnetic induction

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