A point mass \( m \) is placed outside a hollow spherical shell of mass \( M \) and uniform dens...

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A point mass \( m \) is placed outside a hollow spherical shell of mass \( M \) and uniform density at a distance \( d \) from centre of the sphere as shown in figure. Gravitational force on point mass \( m \) at \( P \) is
(a) \( \frac{G m M}{d^{2}} \)
(b) zero
(c) \( \frac{2 G m M}{d^{2}} \)
(d) Data insufficient
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