Question

A system consists of charges +q and +q at the opposite corners of a square of sides 2a and `-q` and `-q` at the other two corners . Calculate the potential and field at a distance r from the centre of the square along a line parallel to the two sides of the square . Assume a `lt lt `r .

Answer 1

Correct Answer - `V = 0 , E = (3q a^(2))/(pi epsi_(0)r^(4))`