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Q.

Which of the following process can be used to heat a metal plate? 

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a

Placing in a time varying magnetic field 

b

Passing either a direct or alternating current through the plate

c

placing in a space varying magnetic field, but does not vary with time

d

Both (A) and (B) are correct

answer is D.

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Detailed Solution

When a metal plate is getting heated, it may be due to the passage of direct current, alternating current or even induced cured through the plate. As time varying magnetic field produces induced current in the plate, so both (1) and (2) are correct.

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