A solid sphere of mass ' M ' and radius ' a' is surrounded by a uniform concentric spherical shell of thickness 2a and mass 2M respectively. The gravitational field at distance, '3a' from the centre should be equal to:
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a
GM3a2
b
GM9a2
c
2GM3a2
d
2GM9at2
answer is A.
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Detailed Solution
Gravitational field g=Gm(3a)2+G(2m)(3a)2g=G3m9a2=Gm3a2