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Four particles, each of mass M and equidistant from each other, move along a circle of radius R under the action of their mutual gravitational attraction. The speed of each particle is -

1. R GM 2 2
2. 2 2 1 ( R GM +
3. 2 1 ) 2 2 1 ( R GM +
4. R GM

Correct answer: 2 1 ) 2 2 1 ( R GM +

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