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Four spheres each of mass m form a square of side d (as shown in figure). A fifth sphere of mass M is situated at the centre of square. The total gravitational potential energy of the system is:

1. ] M 2 4 m ) 2 4 [( d Gm + + −
2. ] m 2 4 M ) 2 4 [( d Gm + + −
3. ] M 2 4 m 3 [ d Gm 2 + −
4. ] M 2 4 m 6 [ d Gm 2 + −

Correct answer: ] M 2 4 m ) 2 4 [( d Gm + + −

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