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Electromagnetic induction

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

1000 ohms
500 ohms
5000 ohms
100 ohms

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Electromagnetic induction
The property of coil by which a counter e.m.f. is induced in it when the current through the coil changes is known as

Self-inductance
Series aiding inductance
Mutual inductance
Capacitance

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

No
Yes

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Electromagnetic induction
Increasing the field or increasing the current will decrease the force on the conductor.

No
Yes

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Electromagnetic induction
Air-core coils are practically free from

None of the listed here
Both Hysteresis losses & Eddy current losses
Eddy current losses
Hysteresis losses

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Electromagnetic induction
Two 300 uH coils in series without mutual coupling have a total inductance of

300 uH
900 uH
600 uH
1200 uH

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