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Four identical particles of mass M are located at the corners of a square of side ‘a’. What should be their speed if each of them revolves under the influence of others gravitational field in a circular orbit circumscribing the square ? a

1. 1.16 a GM
2. 1.21 a GM
3. 1.35 a GM
4. 1.41 a GM

Correct answer: 1.16 a GM

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