A shell of mass \( M \) and radius \( R \) has another point mass \...

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A shell of mass \( M \) and radius \( R \) has another point mass \( m \) placed at a distance \( r \) from its centre \( (rR) \). The force of \( \mathrm{P} \) attraction between the shell and point mass is :
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(A) \( F=\frac{G M m}{r} \)
(B) \( F=\frac{G M m}{r^{2}} \)
(C) \( F= \) zero
(D) None of above
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