Four identical particles of mass M are l...

Four identical particles of mass M are located at the corners of a square of side `a`. What should be their spoed if each of them revolves under the influence of other's gravitational field in a circular orbit circumscribing the square?

`1.35 sqrt(GM/a)`

`1.16 sqrt(GM/a)`

`1.21 sqrt(GM/a)`

`1.41 sqrt(GM/a)`

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