A capacitor charged from a 100 V d.c supply is found to have charge of 20 µC. How much energy is stored in it?

$1 \times 10^{-5}J$ $2 \times 10^{-3}J$ $1 \times 10^{-3}J$ $2 \times 10^{-4}J$

$1 \times 10^{-3}J$

The correct answer is Option (3) → $1 \times 10^{-3}J$