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Questions  

Three particles, each of mass M are moving in a circle under their mutual gravitational forces such that they always form an equilateral triangle of side a while rotating. time period of motion of any particle is :

a
2πa2GM
b
2πa33GM
c
2πa25GM
d
2πa35GM

detailed solution

Correct option is B

Time period T=2πrv=2πa3GMa=2πa33GM

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