The presence of the square of the distance between two particles at the denominator of the formula of Coulomb's law makes it an inverse square law. This property stems from the point nature of the electric charge considered in the formula: since the electric field emanates radially, the field spreads on the surface of a sphere, which is equal to 4 × π × r². In the case of Coulomb's law, experimental results confirm this finding stating that the exponent is 2, and the next 15 decimal places are filled with zeros! Read more