A coin is placed on a disc. The coefficient of friction between the coin and the disc is $\mu$. If the distance of the coin from the center of the disc is $r$, the maximum angular velocity which can be given to the disc, so that the coin does not slip away, is :

Question

$\sqrt{\frac{r}{\mu g}}$

$\sqrt{\frac{\mu g}{r}}$

$\frac{\mu g}{r}$

$\frac{\mu}{\sqrt{r g}}$

Solution

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