Inside a uniform sphere of mass \( M \) and radius \( R \), a cavity of radius \( R / 3 \) is ma...

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Inside a uniform sphere of mass \( M \) and radius \( R \), a cavity of radius \( R / 3 \) is made in the sphere as shown :
Figure \( 6.103 \)
(A) Gravitational field inside the cavity is uniform
(B) Gravitational field inside the cavity is non-uniform
(C) The escape velocity of a particle projected from point \( A \) is
\[
\sqrt{\frac{88 G M}{15 R}}
\]
(D) Escape velocity is defined for earth and particle system only
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