A particle of mass m is placed at the centre of a spherical shell of mass 2 m and radius r. The gravitational potential on the surface of the shell is
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Potential at the surface of the shell = Potential due to particle + Potential due to shell
=(−GMR)+(−2GMR)=(−GMR)+(−2GMR)
=−3GMR
=(−GMR)+(−2GMR)=(−GMR)+(−2GMR)
=−3GMR
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