The force of attraction due to a hollow spherical shell of mass \( M \), radius \( R \) and unif...

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The force of attraction due to a hollow spherical shell of mass \( M \), radius \( R \) and uniform density, on a point mass \( m \) situated inside it is
(a) \( \frac{G m M}{r^{2}} \)
(b) \( \frac{\operatorname{Gm} M}{R^{2}} \)
(c) zero
(d) Data insufficient
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