State coulombs law a capacitor stores

Coulomb's Law states that the electrostatic force ($F$) between two point charges ($q_1$ and $q_2$) is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance ($r$) between them. The force acts along the line joining the two charges.

$$F = k \frac{|q_1 q_2|}{r^2}$$

where $k$ is Coulomb's constant ($k \approx 8.987 \times 10^9 \text{ N}\cdot\text{m}^2/\text{C}^2$).

A capacitor stores electric charge and electrical potential energy in an electric field between its plates.