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

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:

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Position of null point from mass m is
`x=r/(sqrt((4m)/m)+1)=r/3`

`:.` Potential `V=-Gm(3/4+12/(2r))=(-9Gm)/r`
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