Question

The potential difference across a conductor is doubled. Then the rate of generation of heat will

• A. Be doubled
• B. Be halved
• C. Become one-fourth
• D. Become four times

Answer 1

The correct option is D

Become four times

Power- rate of generation of heat

$$\begin{gathered} P=\frac{V^2}{R} \\ =P\alpha V^2 \end{gathered}$$

Therefore, if V doubles P becomes 4 times.

Hence, the correct answer is (D) i.e. becomes four times.