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

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

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Electromagnetic Field Theory
The developed electromagnetic force and or torque in electromechanical energy conversion system act in a direction that tends

 to decrease the stored energy at constant mmf.
 to decrease the stored energy at constant flux.
 to decrease the co-energy at constant mmf.
 to increase the stored energy at constant flux.

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