# Inverse Square Law - for [Force](Force.md) on a charge in an electric field of another charge: [Force](Force.md) is proportional to the product of the charges and inversely proportional to the square of the distance between them - $F_{E}= \frac{\frac{1}{4pe_{0}}Q_{1}Q_{2}}{r^{2}}$ - [Force](Force.md) on a mass in a gravitational field of another mass: [Force](Force.md) is proportional to the product of the masses and inversely proportional to the square of the distance between them - $F_{G}= -G \frac{m_{1}m_{2}}{r^{2}}$