Four particles each of mass M, are located at the vertices of a square with side L. The gravitational potential due to this at the centre of the square is

(a) $-\sqrt{32}\frac{GM}{L}$                                   (b) $-\sqrt{64}\frac{GM}{{L}^{2}}$

(c) zero                                              (d) $\sqrt{32}\frac{GM}{L}$

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Concept Questions :-

Gravitational Potential

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