Ncert Exercises & Solutions

A metal plate is getting heated. It can be because

(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

Choose the correct option

1. (a), (b) and (c)

2. (a), (b) and (d)

3. (b), (c) and (d)

4. all of the above

(a, b, d)

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 a metal plate is subjected to time varying magnetic field, the magnetic flux linked with the plate changes and eddy currents comes into existence which makes the plate hot.

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