Two 2.3-cm-diameter-disks spaced 1.8 mm apart form a parallel-plate capacitor. The electric field between the disks is 4.6×105V/m.
a. What is the voltage across the capacitor? (Express your answer with the appropriate units.)
b. How much charge is on each disk? (Enter your answers numerically separated by a comma.)
c. An electron is launched from the negative plate. It strikes the positive plate at a speed of 2.2×107m/s . What was the electron's speed as it left the negative plate?
(Express your answer with the appropriate units.)