A shell of máss \( M \) and radius \( R \) has a point mass \( m \) placed \( \mathrm{P} \) at a...

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A shell of máss \( M \) and radius \( R \) has a point mass \( m \) placed
\( \mathrm{P} \) at a distance \( r \) from its centre. The gravitational potential energy

W \( U(r) \) vs \( r \) will be :
(A)
(B)
(C)
(D)
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