Two similar balls, each of mass m and charge q, are hung from a common point by two silk threads, each of length l. Prove that separation between the ball is `x=[(q^(2)l)/(2 pi epsilon_(0)mg)]^(1//3)`, if `theta` is small
Find the rate `(dq)/(dt)` with which the charge should leak off each sphere if the velocity of approach varies as `v=a//sqrt(x)`, where a is a constant.