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                                    13. A solid sphere of mass m and radius r is placed insidea hollow thin spherical shell of mass M and radius R asshown in figure (11-E1). A particle of mass m' is placedon the line joining the two centres at a distance a fromthe point of contact of the sphere and the shell. Findthe magnitude of the resultant gravitational force on thisparticle due to the sphere and the shell if (a) r <x < 2r,(b) 2r <<2R and (c) x> 2R.and (e) x> | 
                            
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