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Electromagnetic induction

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
5 H
10 H
15 H

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

Powdered iron core
Iron core
Laminated iron core
Air core

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Electromagnetic induction
Which of the following is unit of inductance?

Weber/metre
Ampere turns
Ohm
Hennry

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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
2.5
2.0

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

Resistance
Inductance
Condenser
Variable resistor

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Electromagnetic induction
As per Faraday's laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it

Moves parallel to the direction of the magnetic field
Lies in a magnetic field
Cuts magnetic flux
Lies perpendicular to the magnetic flux

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