Electromagnetic Field Theory
Cork Screw rule is used to find

 direction of current.
 direction of emf.
 direction of magnetic field.
 direction of electric field.

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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 same direction.
 less than that of disc but in opposite 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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