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A long horizontal rod has a bead which can slide long its length

A long horizontal rod has a bead which can slide long 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 acceleration α.If the coefficient of friction between the rod and the bead is ? and gravity is neglected, then the time after which the bead starts slipping is

Options

(a) √? / α
(b) ? / √α
(c) 1 / √?ￎﾱ
(d) infinitesimal

Correct Answer:

√? / α

Explanation:

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