Question

When the current in a conductor is doubled, keeping other parameters constant, the heating effect of the current will become:

• A. is doubled
• B. becomes 4 times
• C. becomes 3 times
• D. is unaffected

Answer 1

The correct option is B

becomes 4 times

If current is doubled, the heating effect of a current through a conductor becomes 4 times of the original.

$H=I^{2}Rt$
$H_1={I_1}^{2}Rt$ ,
$H_2={I_2}^{2}Rt=(2I_1{)}^{2}Rt=4{I_1}^{2}Rt=4H_1$