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Electromagnetic induction

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

Air core
Iron core
Powdered iron core
Laminated iron core

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Electromagnetic induction
Higher the self-inductance of a coil,

Longer the delay in establishing steady current through it
Lesser its weber-turns
Lower the e.m.f. induced
Greater the flux produced by it

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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
350 mH
None of the listed here
250 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

9 H
10 H
6 H
12 H

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Electromagnetic induction
A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is

500 ohms
5000 ohms
1000 ohms
100 ohms

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Electromagnetic induction
Two coils have inductances of 8 mH and 18 mH and a coefficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be

48 mH
36 mH
30 mH
38 mH

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