A solid sphere of mass m and radius r has a spherical cavity of radius r/2 such that the centre of cavity
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A solid sphere of mass M and radius R has a spherical cavity of radius R/2 such that the centre of cavity is at a distance R/2 from the centre of the sphere. A point mass m is placed inside the cavity at a distanace R/4 from the centre of sphere. The gravitational force on mass m is. ∴F=mFR=GMm2R2.
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