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Electromagnetic induction

Electromagnetic induction
The law that the induced e.m.f. and current always oppose the cause producing them is due to

Newton
Faraday
Coulomb
Lenz

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Electromagnetic induction
Air-core coils are practically free from

Both Hysteresis losses & Eddy current losses
None of the listed here
Eddy current losses
Hysteresis losses

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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
12 mH
24 mH
48 mH

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

100 ohms
5000 ohms
500 ohms
1000 ohms

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

Condenser
Inductance
Resistance
Variable resistor

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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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MORE MCQ ON Electromagnetic induction

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