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A particle is rotated in a vertical circ...

A particle is rotated in a vertical circle by connecting it to a string of length `l` and keeping the other end of the string fixed. The minimum speed of the particle when the string is horizontal for which the particle will complete the circle is

A

`sqrt(3 g l)`

B

`sqrt(2 g l)`

C

`sqrt(g l)`

D

`sqrt((g l)/2)`

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