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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 -

(1)  GM/9a2

(2)  2GM/9a2

(3)  2GM/3a2

(4)  GM/3a2

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Correct option (4)  GM/3a2


According to gauss theorem

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