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20 A cavity of radius R 2 is made inside a solid sphere of radius...

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20 A cavity of radius R 2 is made inside a solid sphere of radius R The centre of the cavity is located a a distance R 2 from the centre of the sphere The gravitational force on a particle of mass m at a distance R 2 from the centre of the sphere on the line joining both the centres of sphere and cavity s opposite to the centre of cavity Here g GM R2 where M is the mass of the solid sphere D none of these A mg 2 B 3 mg 8 C mg 16

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