Question

A metal plate can be heated by

• A. passing either a direct or alternating current through the plate.
• B. placing in a time varying magnetic field.
• C. placing in a space varying magnetic field, but does not vary with time.
• D. both (a) and (b) are correct

Answer 1

The correct option is D both (a) and (b) are correct

When a metal plate is getting heated, it may be due to the passage of direct current, alternating current, or even an induced current passing through the plate. A time-varying magnetic field produces an induced current in the plate, and hence, both (a) and (b) are correct.