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Electromagnetic induction

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

500 ohms
1000 ohms
100 ohms
5000 ohms

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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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Electromagnetic induction
Two 300 uH coils in series without mutual coupling have a total inductance of

900 uH
300 uH
1200 uH
600 uH

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

Laminated iron core
Iron core
Air core
Powdered iron core

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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

Doubled
Unaffected
Quadrupled
Halved

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Electromagnetic induction
The direction of induced e.m.f. can be found by

Kirchhoff s voltage law
Lenz's law
Fleming's right hand rule
Laplace's law

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