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Electromagnetic induction

Electromagnetic induction
Two coils have inductances of 8 mH and 18 mH and a coefficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be

30 mH
48 mH
36 mH
38 mH

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

Unchanged inductance
Reduced inductance
Zero inductance
Increased inductance

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

Laminated iron core
Powdered iron core
Air core
Iron core

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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

0.2 wb
20 wb
2 wb
0.02 wb

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Electromagnetic induction
Reversing the field or the current will reverse the force on the conductor.

No
Yes

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