Electrostatic Field Theory

Abstract

Two small sphere-like charged particles q₁, q₂ (whose radii are very small compared with the distance between them) are immersed in an insulating medium of permittivity ϵ. The magnitude of the force of reaction between them is given by

$$\bar F = \frac{{{q_1}}}{{4\pi }}x\frac{{{q_2}}}{{ \in {d^2}}}N$$

where d is the distance between the particles.