Four particles each of mass \( M \), are located at the vertices of a square with side \( L \). ...

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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) \( -\sqrt{32} \frac{G M}{L} \)
(b) \( -\sqrt{64} \frac{G M}{L^{2}} \)
(c) Zero
(d) \( \sqrt{32} \frac{G M}{L} \)
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