Two concentric spherical shells have masses and radii m1,m2 and radii R1,R2(R1<R2). Calculate the force exerted by this system on a particle of mass m, if it is placed at a distance (R1+R2)2 from the centre.
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Solution
Since R1<R2R1<R1+R22<R2
Thus, the particle lies between two shells.
Hence, only force applied will be that due to inner shell.