A solid sphere of mass 'M' and radius 'a' is
surrounded by a uniform concentric spherical
shell of thickness 2a and mass 2M. The
gravitational field at distance '3a' from the
centre will be :
${{GM} \over {3{a^2}}}$
${{2GM} \over {9{a^2}}}$
${{GM} \over {9{a^2}}}$
${{2GM} \over {3{a^2}}}$
Solution
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