Electromagnetic Field Theory
Which statement does not say that electrostatic field is conservative?

 If is gradient of a scalar potential.
 If the curl of E is identically zero.
 The potential difference between two points is zero.
 The work done in a closed path inside the fields is zero.

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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.
 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.

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