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Electromagnetic induction

Electromagnetic induction
A crack in the magnetic path of an inductor will result in

Unchanged inductance
Increased inductance
Zero inductance
Reduced inductance

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

1000 ohms
5000 ohms
500 ohms
100 ohms

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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

6 mH
48 mH
24 mH
12 mH

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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

48 mH
12 mH
3 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

6 H
12 H
10 H
9 H

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Electromagnetic induction
The polarity of the induced voltage can be determined by using the left-hand generator rule.

Yes
No

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