Question

The potential difference across a conductor is doubled, the rate of generation of heat will:

• A. becomes one fourth
• B. be halved
• C. be doubled
• D. becomes four times

Answer 1

The correct option is D becomes four times

Power - rate of generation of heat
$P=\frac{V^2}{R}$
$\Rightarrow P\propto V^2$
therefore If $V$ doubles $P$ becomes 4 times.