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

Answer: (D)

both $(a)$ and $(b)$ are correct

Answer 2

When a metal plate is getting heated, it may be due to the passage of direct current, alternating current or even induced current through the plate. As time varying magnetic field produces induced current in the plate, so both are correct