The electron gun in an old CRT television accelerates electronsbetween two charged parallel plates (the cathode is negative; theanode is positive) 1.2 cm apart. The potential difference betweenthem is 25 kV. Electrons enter through a small hole in the cathode,are accelerated, and then exit through a small hole in the anode.Assume the plates act as a capacitor.
a. What is the electric field strength and direction between the plates?
b. With what speed doesan electron exit the electron gun if its entry speed is close tozero? [Note: ignore relativity]
c. If the capacitance of theplates is 1 nF, how much charge is stored on each plate? How manyextra electrons does the cathode have?
d. If you wanted to push anelectron from the anode to the cathode, how much work would youhave to do?