Question

Two 2.1-cm-diameter-disks spaced 1.8 mm apart form a parallel-plate capacitor. The electric field between the disks is 4.3×10⁵ V/m

a) What is the voltage across the capacitor?

b) How much charge is on each disk?

c) An electron is launched from the negative plate. It strikes the positive plate at a speed of 2.5×10⁷ m/s . What was the electron's speed as it left the negative plate?

Answer 1