The capacity of a condenser is `4 xx 10^(6)` farad and its potential is `100` volts. The energy released on discharging it fully will be

Options

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

Answer

A

Explanation

Energy in a capacitor is stored as electric potential energy. Therefore energy released on discharging the capacitor is same as the stored potential energy.
`U=(1)/(2)CV^(2)=(1)/(2)xx4xx10^(-6)xx(100)^(2)`
`=0.02J`