P. 3988. A small charged bead of mass m and of charge q can move on a frictionless horizontal rod. A pointlike charge Q whose charge is opposite the charge on the bead, is fixed at a point which is at a distance of d from the rod. The bead is a bit displaced from its equilibrium position and then released. Find the period of the resulted oscillatory motion.
Data: Q=10-8 C, q=-10-8 C, m=1 g, d=10 cm.
Deadline expired on 11 June 2007.