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

The correct option is B 0.02 J

Energy released on descharging the capacitor
$E=\frac{1}{2}C{V}^2$
$=\frac{1}{2}\times 4\times {10}^{-6}\times (100{)}^2=0.02J$