A $r_{1}=\frac{k}{\sqrt{d_{1}}}$
B $r_{2}=\frac{k}{\sqrt{d_{2}}}$
C $\frac{r_{1}}{r_{2}}=\frac{\sqrt{d_{2}}}{\sqrt{d_{1}}}$
D $r_{1}=r_{2}\frac{\sqrt{d_{2}}}{\sqrt{d_{1}}}$
Correct Answer: Option C
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