An electron is moving north at a constant speed of 3.0 X

Chapter 20, Problem 2SL

(choose chapter or problem)

Problem 2SL

An electron is moving north at a constant speed of 3.0 X 104 m/s. (a) In what direction should an electric field point if the electron is to be accelerated to the east? (b) In what direction should a magnetic field point if the electron is to be accelerated to the west? (c) If the electric field of part a has a strength of 330 V/m, what magnetic field (magnitude and direction) will produce zero net force on the electron? (d) If the electron in part c is moving faster than 3.0 X 104 m/s, in which direction will it be accelerated? What if it is moving slower than 3.0 X 104 m/s? (e) Now consider electrons that move perpendicular to both a magnetic field and to an electric field, which are perpendicular to each other. If only electrons with speeds of 5.0 X 104 m/s go straight through undeflected, what is the ratio of the magnitudes of electric field to magnetic field? Without knowing the value of the electric field, can you know the value of the magnetic field?