A single wire $ACB$ passes through a smooth ring at $C$ which revolves at a constant speed in the horizontal circle of radius $r$ as shown in the figure. The speed of revolution is
A single wire $ACB$ passes through a smooth ring at $C$ which revolves at a constant speed in the horizontal circle of radius $r$ as shown in the figure. The speed of revolution is
- A
$\sqrt{rg}$
- B
$\sqrt{2rg}$
- C
$2\sqrt{2rg}$
- D
$2\sqrt{rg}$
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