Four electric charges + q ,+ q ,- q and - q are placed in order at the corners of a square of side 2 ~L . The electric potential at point midway between the two positive charges is

Step-by-step solution

aligned & DP = 5 ~L = CP & AP = BP = L aligned Potential at point P due to the four charges aligned & V = 1 4 ₀ ( q L + q L - q 5 ~L - q 5 ~L ) & = 1 4 ₀ ( 2 q L - 2 q 5 ~L ) & = 1 4 ₀ 2 q L (1- 1 5 ) aligned