Inverse Square Law

• for Force on a charge in an electric field of another charge: Force is proportional to the product of the charges and inversely proportional to the square of the distance between them
• $F_E=\frac{\frac{1}{4p{e}_0}{Q}_1{Q}_2}{r^2}$
• Force on a mass in a gravitational field of another mass: Force is proportional to the product of the masses and inversely proportional to the square of the distance between them
• $F_G=-G\frac{m_1{m}_2}{r^2}$