Four point charges are placed at the corners of a square of side l. Calculate potential at the centre of square.

Charges 1mu coul each are placed at the corners of a squares of side 9 cm. Calculate the potential at the centre of the square.

Four particles each of mass m are placed at the vertices of a square of side l. the potential at the centre of square is

Four particles each of mass m are placed at the vertices of a square of side l. the potential at the centre of square is

Find the potential energy of a system of four particles placed at the vertices of a square of side l. Also obtain the potential at the centre of the square.