A metal plate is getting heated. It can be because

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a direct current is passing through the plate

it is placed in a time varying magnetic field

it is placed in a space varying magnetic field, but does not vary with time

a current (either direct or alternating) is passing through the plate

answer is A, B, D.

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Detailed Solution

A metal plate is getting heated when a DC or AC current is passed through the plate, known as heating effect of current. Also, when metal plate is subjected to time varying magnetic field, the magnetic flux linked with the plate changes and eddy currents comes into existence which make the plate hot.

In case (3) the magnetic flux linked with the plate is not changing with time , so no eddy current is flowing in the disk , as a result no heat is produced.

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