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A particle is rotated in a verticle circ...

A particle is rotated in a verticle circle by connecting it to the end of massless rod of length l and keeping the other end of rod fixed. The minimum speed of the particle when the rod 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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