Question

You can use either electric or magnetic fields to steer moving charges. Suppose you have a beam of electrons moving in the xdirection with speed 1.0×107 m/s, and you want them to turn 30° to their right in a distance of 1.00 cm.(a) [2 pts.] One way to turn the electrons is to run them between two charged plates that are 1.00 cm wide. There will be a uniform electric field between the plates. What direction does the electric field have to have to get the electrons to turn to their right?(b) [2 pts.] What will be the shape of the path the electrons follow?(c) [10 pts.] What magnitude of electric field is needed to get the electrons to turn by 30°? (d) [1 pts.] What is the difference in potential that you need to put across the plates, and which plate should be at the higher potential?(e) [4 pts.] Another way to turn the electrons is to apply a magnetic field (instead of the electric field!). What direction must the magnetic field have in order for the electrons to turn to their right?(f) [2 pts.] What will be the shape of the path the electrons follow?(g) [10 pts.] What magnitude of magnetic field is needed to get the electrons to turn by 30°? (h) [4 pts.] Which scheme, if either, has the electrons moving faster when they exit the field?

Answer 1