Question

When the current in a conductor is doubled, keeping its resistance constant, the heat generated in the conductor will be:

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

Answer 1

The correct option is B

becomes 4 times

We know heat produced in a conductor is $H=I^{2}Rt$, where '$I$' is the current flowing, '$R$' is the resistance of wire and '$t$' is the time for which current is flowing in a conductor.

When electrical resistance '$R$' and time period '$t$' is kept constant then, $H\propto I^2$.
So, if the current is doubled, the heating effect of a current through a conductor becomes 4 times of the original.