Columbs law

The electric force acting on a point charge q1 as a result of the presence of a second point charge q2 is given by Coulomb's Law:

where ε0 = permittivity of space

Note that this satisfies Newton's third law because it implies that exactly the same magnitude of force acts on q2 . Coulomb's law is a vector equation and includes the fact that the force acts along the line joining the charges. Like charges repel and unlike charges attract. Coulomb's law describes a force of infinite range which obeys the inverse square law, and is of the same form as the gravity force.