A uniform ring of mass m is lying at a distance `sqrt(3)` a from the centre of mass M just over the sphere (where a is the radius of the ring as well as that of the sphere). Find the magnitude of gravitational force between them .
A. `(GMm)/(8R^(2))`
B. `(GMm)/(3R^(2))`
C. `sqrt3(GMm)/(R^(2))`
D. `sqrt3(GMm)/(8R^(2))`
