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Q.

The figure represents a solid uniform sphere of mass M and radius R. Centre of a spherical cavity of radius r  is at a distance a from the centre of the sphere. The gravitational field inside the cavity is

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a

towards the centre of the cavity

b

non uniform

c

directly proportional to a 

d

uniform both in magnitude and direction

answer is C, D.

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Detailed Solution

The gravity field inside the cavity E→=43πGρa→

E α a & it is uniform [Refer L.S. Ex.IV– 6]

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