Three particles each of mass m are placed at the comers of an equilateral triangle of side , d. Calculate
the potential energy of the system

Explanation

As in case of two - particle system potential energy is given by `(- (Gm_(1) m_(2))/(r)), ` so
`U_(A) = U_(12) + U_(23) + U_(31)`
So, `U_(A) = - (3Gm m )/(d) = - (3 Gm^(2))/( d)`