Electric charges of +10μC,+5μC,−3μC and +8μC are placed at the corners 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 it’s centre from each corner is 22=1m.Potential at the centre V=9×10910 ×10−61+5×10−61−3×10−61+8×10−61=1.8×105V