A long conducting rod is pulled with constant speed in a direction parallel to a…
PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
A long conducting rod is pulled with constant speed in a direction parallel to a uniform magnetic field B. Which of the following best describes the magnitude of the induced emf between the ends of the rod?
(a) ε is maximum because the rod cuts magnetic field lines continuously.
(b) ε is zero because the component of velocity perpendicular to B is zero.
(c) ε=Blv since only the speed of the rod matters, not its direction with respect to B.
(d) ε cannot be predicted without knowing the area swept out by the rod.