The Earth is an approximate sphere. If the interior contained matter which is not of the same density everywhere, then on the surface of the Earth, the acceleration due to gravity:
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Verified by ExpertsThe correct answer is:
D
If we assume the Earth as a sphere of uniform density, then it can be treated as point mass
placed at its center. In this case acceleration due to gravity 
, at the center.
It is not so, if the Earth is considered as a sphere of nonuniform density, in that case value of 
will be different at different points and cannot be zero at any point.
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