Question

Two bodies of masses m and 4m are placed at a distance r. The gravitational potential at a point on the line joining them where the gravitational field is zero is

(a) zero 

(b) − (4(Gm)/r)

(c) − (6(Gm)/r)

(d) − (9(Gm)/r)

Answer 1

(d) : Let x be the distance of the point P from the mass m where gravitational field is zero.