Coulomb's Law describes the fundamental force between stationary electric charges.

• The magnitude of the force ($F$) is directly proportional to the product of the magnitudes of the charges ($q_1{q}_2$).
• It is inversely proportional to the square of the distance ($r$) between them. $F=k\frac{q_1{q}_2}{r^2}$ where $k$ is Coulomb's constant ($k=\frac{1}{4\pi {ϵ}_0}\approx 9\times 10^9{\text{ Nm}}^2/{\text{C}}^2$).