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

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

(a) $-\sqrt{32}\frac{G M}{L}$

(b) $-\sqrt{64}\frac{G M}{L^2}$

(c) Zero

(d) $\sqrt{32}\frac{G M}{L}$