The value of the gravitational potential at the centre of a ring of radius “a” and mass “M” is :

-(G*M)/a zero infinite -(G*M)/a1/2

-(G*M)/a

We know that the gravitational potential at a point “p” at a distance of “r” from the centre of the ring of radius “a” and mass M” is; V = -(G*M)/(a2+r2)1/2 At the centre of the ring; r = 0. Therefore; V = -(G*M)/a.