A condenser of capacity `50 mu F` is charged to `10` volts. Its energy is equal to

Options

A. `2.5 xx 10^(-3)J`
B. `2.5 xx 10^(-4)J`
C. `5 xx 10^(-2)J`
D. `1.2 xx 10^(8)J`

Answer

A

Explanation

`U = (1)/(2) CV^(2) = (1)/(2) xx 50 xx 10^(-6) xx (10)^(2) = 2.5 xx 10^(-3) J`