Question

Heat produced in a wire of resistance $R$ due to current flowing at a constant potential difference is proportional to

• A. $1/R^2$
• B. $1/R$
• C. $R$
• D. $R^2$

Answer 1

Answer: (B)

$H=\frac{V^{2}t}{R}$
$\because V$ is constant
$\therefore$ For constant time $H\propto \frac{1}{R}$