A point mass \( m \) is placed inside a spherical shell of radius \( R \) and mass \( M \). at a...

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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
[DUMET 2009]
(a) \( \frac{G M m}{R^{2}} \)
(b) \( -\frac{G M m}{R^{2}} \)
(c) Zero
(d) \( 4 \frac{G M m}{R^{2}} \)
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