A problem of practical interest is to make a beam of electrons turn a corner. This can be done with the parallel-plate capacitor shown in FIGURE. An electron with kinetic energy enters through a small hole in the bottom plate of the capacitor.
a. Should the bottom plate be charged positive or negative relative to the top plate if you want the electron to turn to the right? Explain.
b. What strength electric field is needed if the electron is to emerge from an exit hole away from the entrance hole, traveling at right angles to its original direction?
Hint: The difficulty of this problem depends on how you choose your coordinate system.
c. What minimum separation must the capacitor plates have?
(a) The bottom plate is negative to the top plate.
(b) Strength electrical field, of electron to emerge
(c) minimum separation, of the capacitor of plates is
A moving electron in a magnetic field
The force on the electron is downward since the electrical field points upwards.
The electron will travel in a parabolic path.
Using the equation,
is the maximum height of the capacitor plate,
You've hung two very large sheets of plastic facing each other with distancebetween them, as shown in. By rubbing them with wool and silk, you've managed to give one sheet a uniform surface charge density and the other a uniform surface charge density . What are the electric field vectors at points,and
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