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A bob is suspended from an ideal string ...

A bob is suspended from an ideal string of length l. Now it is pulled to a side till the string makes an angle `60^@` to the vertical and whirled along a horizontal circle. Then its period of revolution is

A

`pi sqrt ((l)/(g))`

B

`pi sqrt ((l)/(2g))`

C

`pi sqrt ((2l)/g)`

D

`2 pi sqrt ((l)/(g)`

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