E 403/503 Homework # 5 Deadline 10/19/04

1- An electron lies at rest in the magnetic field of an infinite straight wire carrying a current I. At t=0, the wire is suddenly charged to a positive potential V₀ without affecting I. The electron gains energy from the electric field and begins to drift. Draw a diagram showing the orbit of the electron and relative direction of I, B, V_E, V_{gard B}, and V_R . (30)

2- A H⁺ make 100 revolutions while moving 1 μm perpendicular to an electric and magnetic field, which are in turn, perpendicular to each other. How strong is the magnetic induction B when E is equal to 10 V/m. (30)