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:

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

Two bodies of masses m and 9m are placed at a distance 'r'.The gravitational potential at a point on the line joining them where gravitational field is zero is (G is universal gravitational constant)

Two bodies of masses .m. and .9m. are placed at a distance .r.. The gravitational potential at a point on the line joining them, where gravitational field is zero, is (G is universal gravitational constant )