A uniform ring of mass M and radius R is placed directly above a uniform sphere of mass 8 M and of same radius R. the centre of the ring is at a distance of d = √3 R form the centre of the sphere. The gravitational attraction between the sphere and the ring is:

Q: A uniform ring of mass M and radius R is placed directly above a uniform sphere of mass 8 M and of same radius R. the centre of the ring is at a distance of d = √3 R form the centre of the sphere. The gravitational attraction between the sphere and the ring is:

(a) $\frac{G M^2}{R^2}$

(b) $\frac{3 G M^2}{2 R^2}$

(c) $\frac{2 G M^2}{\sqrt{2}R^2}$

(d) $\frac{\sqrt{3}G M^2}{R^2}$

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Ans: (d)