If the coefficient of friction between an insect and bowl is $\mu$ and the radius of the bowl, is $r$, the maximum height to which the insect can crawl in the bowl is :
- A$\frac{r}{\sqrt{1+\mu^2}}$
- B$r\left[1-\frac{1}{\sqrt{1+\mu^2}}\right]$
- C$r \sqrt{1+\mu^2}$
- D$r \sqrt{1+\mu^2}-1$
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