Find the potential energy of a system of eight particles placed at the vertices of a cube of side L. neglect the self energy of the particles.

Find the potential energy of a system of eight particles of mass M placed at the vertices of a cube of side L. neglect the self energy of the particles.

Find the potential energy of a system of four particles each of mass m placed at the vertices of a square of side I .

Find the potential energy of a system of 3 particles kept at the vertices of an equilateral triangle of side r.

Find the potential energy of a system of 3 particles kept at the vertices of an equilateral triangle of side r.