The force (sometimes called the Coulomb force) between two charged particles, regarded as point charges Q1 and Q2 a distance d apart, is proportional to the product of the charges and inversely proportional to the square of the distance between them. The law is now usually stated in the form F = Q1Q2/4πεd2, where ε is the absolute permittivity of the intervening medium. ε = εrε0, where εr is the relative permittivity (the dielectric constant) and ε0 is the electric constant. The electric field surrounding a point charge is called the Coulomb field and the scattering of charged particles by the Coulomb field surrounding an atomic nucleus is called Coulomb scattering. The law was first published by Charles de Coulomb in 1785. This law was found independently by Henry Cavendish.
Subjects: Chemistry — Physics.