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\( \mathrm{P} \)
W
If the acceleration due to gravity inside the earth is to be kept constant, then the relation between the density \( \mathrm{d} \) and the distance \( \mathrm{r} \) from the centre of earth will be -
(a) \( \mathrm{d} \propto \mathrm{r} \)
(b) \( \mathrm{d} \propto \mathrm{r}^{1 / 2} \)
(c) \( \mathrm{d} \propto 1 / \mathrm{r} \)
(d) \( \mathrm{d} \propto \frac{1}{\mathrm{r}^{2}} \)
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