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Electromagnetic induction

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

12 mH
3 mH
24 mH
28 mH

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Electromagnetic induction
Which of the following circuit elements will oppose the change in circuit current?

Resistance
All of the listed here
Inductance
Capacitance

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Electromagnetic induction
The self inductances of two coils are 8 mH and 18 mH. If the coefficient of coupling is 0.5, the mutual inductance of the coils is

36 mH
6 mH
18 mH
12 mH

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

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

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Electromagnetic induction
Air-core coils are practically free from

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

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

Yes
No

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