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18 A uniform metal ring of mass m and radius r is placed directly above...

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18 A uniform metal ring of mass m and radius r is placed directly above a uniform sphere made up of same metal of mass M and of equal radius The centre of the ring is directly above the centre of the sphere at a distance 2 2r as shown in the figure The gravitational force exerted by the sphere on the ring will be 3GMm A 8r D GMm 10r B C 3 3 GMm 8r GMm 8r 3 2 2r 3

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