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

 The work done in a closed path inside the fields is zero.
 If is gradient of a scalar potential.
 The potential difference between two points is zero.
 If the curl of E is identically 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 same direction.
 less than that of disc and in the same direction.
 equal to that of disc and in the opposite direction.
 less than that of disc but in opposite direction.

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