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Question

A metal plate is not getting heated. It is because
  1. A direct current is passing through the plate
  2. It is placed in a time varying magnetic field
  3. It is placed in a space varying magnetic field, but does not vary with time
  4. A current (either direct or alternating) is passing through the plate

A
It is placed in a space varying magnetic field, but does not vary with time
B
A current (either direct or alternating) is passing through the plate
C
A direct current is passing through the plate
D
It is placed in a time varying magnetic field
Solution
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When the plate gets heated it can be due to passage of direct current on alternating current or induced current through the plate. As time varies the magnetic field produces current in the late. Hence, a, b and are the correct options.

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