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Electromagnetic induction

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
36 mH
18 mH
6 mH

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Electromagnetic induction
Air-core coils are practically free from

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

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Electromagnetic induction
Which of the following circuit element stores energy in the electromagnetic field?

Condenser
Resistance
Variable resistor
Inductance

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

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

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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 be

3 mH
48 mH
12 mH
24 mH

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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

12 H
9 H
6 H
10 H

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