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Electromagnetic induction

Electromagnetic induction
A moving magnetic field will produce the same effect as a conductor that is moving.

True
False

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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

24 mH
48 mH
3 mH
12 mH

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Electromagnetic induction
Which of the following circuit elements will oppose the change in circuit current?

All of the listed here
Capacitance
Inductance
Resistance

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Electromagnetic induction
The coefficient of coupling between two air core coils depends on

Mutual inductance and self inductance of two coils
Mutual inductance between two coils only
Self-inductance of two coils only
None of the listed here

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Electromagnetic induction
Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is

20 H
15 H
10 H
5 H

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Electromagnetic induction
In case of an inductance, current is proportional to

Magnetic field
Both of the listed here
Voltage across the inductance
None of the listed here

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