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Q.

A solid sphere of mass ‘2M’ and radius ‘2a’ is surrounded by a uniform concentric spherical shell of thickness 3a and mass 3M. The gravitational field at distance ‘5a’ from the centre will be:

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a

GM3a2

b

GM5a2

c

2GM3a2

d

2GM9a2

answer is B.

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Detailed Solution

Eg=G2M(5a)2+G3M(5a)2=5GM25a2=Gm5a2

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