The size of the electric force between two objects is affected by the strength of the charge and the distance between the objects. Objects with strong positive and negative charges will have a greater electric force. As the distance between the objects decreases, the electrical force increases.
In the late 1700s, Charles Augustin de Coulomb received credit for discovering how electric forces work. His observations are known as Coulomb's Law. Coulomb was not the only scientist working with electrical force at that time. Henry Cavendish, Joseph Priestly and Charles Stanhope were doing similar experiments. Cavendish developed the same theories as Coulomb, but failed to receive credit for his discovery since he did not publish his work.