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There is a shell of mass $\mathrm{M}$ and density of the shell is uniform. The work done to take a point mass from point $\mathrm{A}$ to $\mathrm{B}$ is $[\mathrm{AB}=\mathrm{r}]$
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The correct answer is:
zero
Gravitaional field inside the shell is zero, so no work required.
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