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Two identical particles each of mass 'm'...

Two identical particles each of mass 'm' go round a circle of radius a under the action of their mutual gravitational attraction.The angular speed of each particle will be:

A

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

B

`sqrt((Gm)/(2a^3))`

C

`sqrt((Gm)/(8a^3))`

D

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

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