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A particle of mass \( m \) lies at a distance \( r \) from the centre of earth. The force of attraction between the particle and earth as
\( P \) a function of distance is \( F(r) \),

W.
(A) \( F(r) \propto \frac{1}{r^{2}} \) for \( rR \)
(B) \( F(r) \propto \frac{1}{r^{2}} \) for \( r \geq R \)
(C) \( F(r) \propto r \) for \( rR \)
(D) \( F(r) \propto \frac{1}{r} \) for \( rR \)
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