A conducting rod is free to slide along a pair of

Chapter 22, Problem 22.26

(choose chapter or problem)

A conducting rod is free to slide along a pair of conducting rails, in a region where a uniform and constant (in time) magnetic field is directed into the plane of the paper, as the drawing illustrates. Initially the rod is at rest. There is no friction between the rails and the rod. What happens to the rod after the switch is closed? If any induced emf develops, be sure to account for its effect. (a) The rod accelerates to the right, its velocity increasing without limit. (b) The rod does not move. (c) The rod accelerates to the right for a while and then slows down and comes to a halt. (d) The rod accelerates to the right and eventually reaches a constant velocity at which it continues to move.