A metal plate is getting heated . It can be because

Options

A. a direct current is passing through the plate
B. it is placed in a time varying magnetic field
C. it is placed in a space varying magnetic field but does not vary with time
D. a current (either direct or alternating) is passing through the plate

Answer

C

Explanation

Due to heating effect of electric current, the plate is heated when A.C. or D.C. is passed through it. Thus (a) and (d) are correct. Similarly in a time varying magnetic field, the magnetic flux changes and eddy currents are produced in the plate and it become hot. Thus (b) is correct. only option (c) is wrong.