Q: Two metallic spheres each of mass M are suspended by two strings each of length L. the distance between the upper ends of string is L . The angle which the strings will make with the vertical the to mutual attraction of the spheres is:

(a) $tan^{-1}\frac{G M}{g L}$

(b) $tan^{-1}\frac{G M}{2 g L}$

(c) $tan^{-1}\frac{G M}{g L^2}$

(d) $tan^{-1}\frac{2 G M}{g L^2}$

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Ans: (c)