E0 is the vacuum permittivity. Use the coulombs law and then the magnitude of the force of attraction repulsion between the point charges is as follows. The potential from a co.
F k q 1 q 2 r 2.
F Ke q1 q2 r2. Simply click once on one point then click again on the second point. The Problem of the Hanging Charges. You can click more than two points in order to build up a continuous route.