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A long horizontal rod has a bead which c...

A long horizontal rod has a bead which can slide along its length, and initially placed at a distance L from one end A of the rod. The rod is set in angular motion about A with constant angular accleration `alpha`. If the coefficient of friction between the rod and the bead is `mu`, and gravity is neglected , then the time after which the bead starts slipping is

A

`sqrt (mu/alpha)`

B

` (mu/alpha)`

C

`1/sqrt (mualpha)`

D

infinitesimal

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