Electromagnetic Field Theory
In order to minimize loss due to hysteresis the magnetic material should have

 large coercivity.
 high hysteresis coefficient.
 small B-H loop area.
 high resistivity.

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Electromagnetic Field Theory
A copper disc is rotated rapidly below a freely suspended magnetic needle. The magnetic needle starts rotating with velocity

 equal to that of disc and in the opposite direction.
 equal to that of disc and in the same direction.
 less than that of disc and in the same direction.
 less than that of disc but in opposite direction.

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