Question

A uniform ring of mass m and radius r is placed directly above a uniform sphere of mass M and of equal
3 r as shown below.
radius. The centre of the ring is directly above the centre of the sphere at a distance
The gravitational force exerted by the sphere on the ring will be

Answer 1

Answer:

Explanation:

I had the same doubt .. I’m rather new to this chapter ... can some one explain why I can’t concentrate the masses of the 2 objects at their centre and apply the F=GMm/r^2 where r=3r according to this question