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

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Q. A point mass $m$ is placed inside a spherical shell of radius $R$ and mass $M$ at a distance $\frac{R}{2}$ from the centre of the shell. The gravitational force exerted by the shell on the point mass is

Gravitation

Solution:

If a point mass is placed inside a uniform spherical shell, the gravitational force on the point mass is zero. Hence, the gravitational force exerted by the shell on the point mass is zero.