question_answer

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                                                                             [AIEEE 2011]

A)  \[-\frac{9Gm}{r}\]                    

B)  Zero

C)  \[-\frac{4Gm}{r}\]        

D)       \[-\frac{6Gm}{r}\]

Correct Answer: A

Solution :

[a] Field is zero at O.