A solid sphere of mass m and radius r is placed in side a hollow spherical shell of mass M and radius R as shown in figure.A particle of mass m' is placed on the line joining the two centres at distance x from the point of contact of the sphere and the shell.Find the magnitude of the resultant gravitational force due to the sphere and the shell if (a)r<x<2r ,(b)2r<x<2R and (c)x>2R.
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