Two particles of masses 'm' and '9m' are...

Two particles of masses 'm' and '9m' are separated by a distance 'r'. At a point on the line joining them the gravitational field is zero. The gravitational potential at that point is (G = Universal constant of gravitation)

`-(4Gm)/r`

`-(8Gm)/r`

`-(16Gm)/r`

`-(32Gm)/r`

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