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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(gl) `

B

`sqrt(2gl) `

C

`sqrt(3gl) `

D

`sqrt(5gl) `

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The correct Answer is:
C
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