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Two bodies of masses m and 4 m are place...

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

A

zero

B

`-frac(4Gm)®`

C

`-frac(6Gm)r `

D

`-frac(9Gm)r `

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