1.

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                        [Kerala PET 2005]

A.             \[-\sqrt{32}\frac{GM}{L}\]
B.               \[-\sqrt{64}\frac{GM}{{{L}^{2}}}\]
C.             Zero    
D.             \[\sqrt{32}\frac{GM}{L}\]
Answer» B.               \[-\sqrt{64}\frac{GM}{{{L}^{2}}}\]


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