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As we go to greater depths inside the Earth, the value of $g$:
ADecreases
BIncreases steadily
CRemains exactly constant
DFirst decreases then increases
Answer & Solution
Correct answer: A. Decreases
1. Going inside the Earth decreases the distance $r$ from the centre, which alone would raise $g$.
2. But the mass $M$ effectively attracting the body also decreases as we go deeper.
3. As a combined result of the changes in $r$ and $M$, the value of $g$ decreases.
4. It is not constant and does not increase, so those options are wrong.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 1 "Gravitation", p.18_
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