Two 2.50-cm-diameter disks spaced 2.00mmapart form a parallel-plate capacitor. The electric field between the disks is 4.60×105V/m .
Part A What is the voltage across the capacitor?
Part B An electron is launched from the negative plate. It strikes the positive plate at a speed of 2.00×107m/s. What was the electron's speed as it left the negative plate?