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Electromagnetic induction

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

Reduced inductance
Unchanged inductance
Increased inductance
Zero inductance

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Electromagnetic induction
The self-inductance of the coil may be defined as equal to the e.m.f. induced in volts when the current in the circuit changes at the rate of unit Weber turns.

No
Yes

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Electromagnetic induction
Higher the self-inductance of a coil,

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

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Electromagnetic induction
Air-core coils are practically free from

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

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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

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

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Electromagnetic induction
A moving magnetic field will produce the same effect as a conductor that is moving.

False
True

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