Question

The capacity of a condenser is $4\times {10}^{-6}$ farad and its potential is 100 volts. The energy released on discharging it fully will be:

• A. 0.04 J
• B. 0.02 J
• C. 0.025 J
• D. 0.05 J

Answer 1

Answer: (B)

The energy released on discharging the capacitor fully, is given by $E=\frac{1}{2}C{V}^2=\frac{1}{2}\times 4\times {10}^{-6}\times {(100)}^2$ $=2\times {10}^{-2}=0.02J$