Four particles each of mass 'm' are placed at the four vertices of a square 'a' .Find net force on any one the particle.

Four particles each of mass m are kept at the four vertices of a square of side 'a' . Find graitational potential energy of this system.

Four particles each of mass m are kept at the four vertices of a square of side 'a' . Find gravitational potential energy of this system.

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

Four particle each of mass 1kg are at the four orners of a square of side 1m . The work done to move one of the particles to infinity