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Electromagnetic induction

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

100 ohms
500 ohms
1000 ohms
5000 ohms

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Electromagnetic induction
Which of the following circuit element stores energy in the electromagnetic field?

Variable resistor
Condenser
Resistance
Inductance

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Electromagnetic induction
The polarity of the induced voltage can be determined by using the left-hand generator rule.

Yes
No

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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

12 V
25 V
15 V
10 V

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Electromagnetic induction
Reversing the field or the current will reverse the force on the conductor.

No
Yes

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Electromagnetic induction
The coefficient of coupling between two air core coils depends on

Self-inductance of two coils only
Mutual inductance and self inductance of two coils
None of the listed here
Mutual inductance between two coils only

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