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Electromagnetic induction

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

Unchanged inductance
Zero inductance
Increased inductance
Reduced inductance

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

Halved
Unaffected
Quadrupled
Doubled

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Electromagnetic induction
In case all the flux from the current in coil 1 links with coil 2, the coefficient of coupling will be

1.0
0.5
2.0
2.5

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Electromagnetic induction
Lenz's law is a consequence of the law of conservation of

Charge
Induced current
Induced e.m.f.
Energy

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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
10 H
6 H

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Electromagnetic induction
An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is

2 wb
0.2 wb
20 wb
0.02 wb

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MORE MCQ ON Electromagnetic induction

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