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Electromagnetic induction

Electromagnetic induction
Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be

Quadrupled
Halved
Doubled
Unaffected

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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
Mutual inductance between two coils only
Self-inductance of two coils only
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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Electromagnetic induction
A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by

Change of number of turns of coil
Variation in voltage to the coil
Variation in coil current
The resistance of magnetic path

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

900 uH
300 uH
1200 uH
600 uH

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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

10 V
12 V
15 V
25 V

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