Question:medium

A solid sphere of mass M and radius R is placed inside a spherical shell of mass M and radius 4R such that their surfaces touch each other. The gravitational force due to the spherical shell and solid sphere on a body of unit mass placed at the centre of the spherical shell is (G = Universal gravitational constant)

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Key Shell Theorem points: 1. Field inside a shell is zero. 2. Field outside a spherical distribution is $\frac{GM}{r^2}$ (point mass approx).

Updated On: Mar 31, 2026

$\frac{25GM}{144R^2}$
$\frac{GM}{9R^2}$
$\frac{7GM}{144R^2}$
Zero

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The Correct Option is B

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