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 acceleration `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)/(sqrtalpha)`
C. `(1)/(sqrt(mualpha))`
D. infinitesimal
