If two point charges are brought near each other, each of them exerts a force on the other. Thus, the two charges exchange equal and opposite forces. The force between the two charges is an “action-at a-distance” force. It can act across empty space and does not need any matter in the intervening space to transmit the force. This interaction force can be quantified by Coulomb’s law. Coulomb law clearly defines how the interaction force can be determined. Coulomb’s law is defined as follows:

"The force of interaction of two electrostatic point charges in vacuum is directly proportional to the product of the two charges and inversely proportional to the square of their separation".