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A point mass m is placed inside a spheri...

A point mass m is placed inside a spherical shell of radius R and mass M at a distance `R/2` form the centre of the shell. The gravitational force exerted by the shell on the point mass is

A

`(GMm)/R^(2)`

B

`(GMw)/R^2`

C

zero

D

`4frac(GMm)(R^2)`

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