A charge – Q is placed at some distance from a neutral conductor. Charge is induced on its surface. In the neighbourhood of a point P on its surface, the charge density is `sigma C//m^2`. Consider a small area `DeltaS` on the surface of the conductor encircling point P. Find the resultant force experienced by the area `DeltaS` due to charge present on the surface elsewhere and the charge – Q.

Answer

`(sigma^(2))/(2epsilon_(0))Deltas`