Q84 / 120 · VITEEE 2011 · Physics
The capacity of a capacitor is $4 \times 10^{-6} \mathrm{~F}$ and its potential is $100 \mathrm{~V}$. The energy released on discharging it fully will be
- Correct answerA$0.02 \mathrm{~J}$
- B$0.04 \mathrm{~J}$
- C$0.025 \mathrm{~J}$
- D$0.05 \mathrm{~J}$
Solution
Energy released on discharge of capacitor
$$
\begin{array}{l}
U=\frac{1}{2} C V^{2} \\
=\frac{1}{2} \times 4 \times 10^{-6} \times(100)^{2}=0.02 \mathrm{~J}
\end{array}
$$
Hence, the correct answer is option: 'A'.