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A uniform solid sphere of mass m1 and radius R1 is inside and concentric with a...

A uniform solid sphere of mass m1 and radius R1 is inside and concentric with a spherical shell of mass m2 and radius R2. Find the gravitational force exerted by spheres on a particle of mass m located at (1).r < R1 (2).R1 < r < R2 (3).r > R2
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