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Electromagnetic induction

Electromagnetic induction
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

10 H
12 H
9 H
6 H

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Electromagnetic induction
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

24 mH
12 mH
48 mH
6 mH

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Electromagnetic induction
The self-inductance of the coil may be defined as equal to the e.m.f. induced in volts when the current in the circuit changes at the rate of unit Weber turns.

No
Yes

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Electromagnetic induction
The magnitude of the induced e.m.f. in a conductor depends on the

Flux density of the magnetic field
Rate of change of flux-linkages
Amount of flux cut
Amount of flux linkages

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

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

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Electromagnetic induction
An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be

20 A/s
12 A/s
4 A/s
16 A/s

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