Electric charges of +10μC,+5μC,-3μC and +8μC are placed at the comers of a square of side 2 m . The potential at the centre of the square is

Length of each side of square is 2 m , so distance of .Its centre from each corner is 22=1 mPotential at the centre,V=9×10910×10-6+5×10-61-3×10-61+8×10-61 = 1.8 X 105 V