Two 1.90 c m -diameter disks spaced 1.80 m m apart form a parallel-plate capacit

Question

Two 1.90cm -diameter disks spaced 1.80mm apart form a parallel-plate capacitor. The electric field between the disks is 4.70

Two 1.90cm -diameter disks spaced 1.80mm apart form a parallel-plate capacitor. The electric field between the disks is 4.70 x 105V/m. Part A What is the voltage across the capacitor? Part B How much charge is on each disk? Part C An electron is launched from the negative plate. It strikes the positive plate at a speed of 2.20 x 107m/s. What was the electron's speed as it left the negative plate?

Explanation / Answer

C = epsilon *A/d = 1.39 pF

a) Voltage = E*d = 4.70

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