# How are electric forces and charge related?

• $F = \frac{k {Q}_{1} {Q}_{2}}{{r}^{2}}$ where ${Q}_{1}$ and ${Q}_{2}$ are the two charges in coulombs, k is the Coulomb constant ($8.9875 \times {10}^{9} \frac{N \cdot {m}^{2}}{{C}^{2}}$ ) , and r is the distance between the centers of the two charges in meters.