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Electromagnetic induction

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

Iron core
Powdered iron core
Laminated iron core
Air core

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

Unchanged inductance
Zero inductance
Reduced inductance
Increased inductance

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Electromagnetic induction
The polarity of the induced voltage can be determined by using the left-hand generator rule.

Yes
No

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Electromagnetic induction
Higher the self-inductance of a coil,

Lesser its weber-turns
Longer the delay in establishing steady current through it
Greater the flux produced by it
Lower the e.m.f. induced

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Electromagnetic induction
Increasing the field or increasing the current will decrease the force on the conductor.

No
Yes

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Electromagnetic induction
Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be

6 H
10 H
9 H
12 H

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