when you double the charge on both particles in a pair, what effect
In comparison to the particle charges, a change to the distance has more influence on the force. However, the particle charges and distance always work together to affect the force. Finally, the unit of electric charge is called the coulomb. To unlock this lesson you must be a Study.com Member.he Effect of Distance Between Charges. The force between charged particles is very dependent on the distance between them, even more so than on the particle charges we just discussed. In Coulomb's equation, the distance between particles is represented by the term d.