1.

A uniform ring of mass M and radius R is placed directly above a uniform sphere of mass 8M and of same radius R. The centre of the ring is at a distance of d = sqrt(3)R from the centre of the sphere. The gravitational attractionbetween the sphere and the ring is

Answer»

`(GM^2)/(R^2)`
`(3GM^2)/(R^3)`
`(2GM^2)/(SQRT(2)R^2)`
`(sqrt(3)GM^2)/(R^2)`

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