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A particle of mass M is situated at d centre of a spherical shell of same mass & radius a.the gravitational potential at a pt.situated at a/2 distance from centre,will be?

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kvnmurty
potential due to particle and spherical shell will be added at distance a/2

=  - G M / 0.5 a   - G M / 0.5 a  = - GM / a

PE due to point mass  = - G M / distance

PE Due to sph shell = - GM / distance from center

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