$A$ bucket containing water is revolved in a vertical circle of radius $r$. To prevent the water from falling down, the minimum frequency of revolution required is $[g = \text{acceleration due to gravity}]$.
- A$\frac{1}{2 \pi} \sqrt{\frac{g}{r}}$
- B$2 \pi \sqrt{\frac{g}{r}}$
- C$\frac{2 \pi g}{r}$
- D$\frac{1}{2 \pi} \sqrt{\frac{r}{g}}$
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