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Three particles, each of mass m are fixe...

Three particles, each of mass `m` are fixed at the vertices of an equilateral triangle of side length `a`. The only forces acting on the particles are their mutual gravitational forces. Then answer the following questions.

The gravitational potential at `O` is

A

`(-3Gm)/(a)`

B

`(-3sqrt(3)Gm)/(a)`

C

`(-6Gm)/(a)`

D

`(-4sqrt(3)Gm)/(a)`

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