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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. 2 a 9 GM
2. 2 a 9 GM 2
3. 2 a 3 GM 2
4. 2 a 3 GM

Correct answer: 2 a 3 GM

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