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Electromagnetic induction

Electromagnetic induction
A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is

3500 mH
250 mH
None of the listed here
350 mH

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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

48 mH
6 mH
24 mH
12 mH

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Electromagnetic induction
The law that the induced e.m.f. and current always oppose the cause producing them is due to

Newton
Coulomb
Lenz
Faraday

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Electromagnetic induction
For a purely inductive circuit which of the following is true?

Actual power of the circuit is zero
Relative power is zero
Apparent power is zero
Any capacitance even if present in the circuit will not be charged

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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

12 mH
6 mH
18 mH
36 mH

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Electromagnetic induction
Which of the following inductor will have the least eddy current losses?

Air core
Iron core
Laminated iron core
Powdered iron core

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