Three particles each of mass \( m \) are kept at vertices of an equilateral triangle of side \( ...

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Three particles each of mass \( m \) are kept at vertices of an equilateral triangle of side \( L \). The gravitational potential at the centre due to these particles is
(a) \( -\frac{3 G m}{L} \)
(b) \( \frac{-9 G m}{\sqrt{3} L} \)
(c) \( -\frac{3 \sqrt{3} G m}{L} \)
(d) Both (b) and (c)
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