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28.20 Two 2.50-cm-diameter disks spaced 2.10 mm apart form a parallel-plate capacitor. The electric field between...

28.20 Two 2.50-cm-diameter disks spaced 2.10 mm apart form a parallel-plate capacitor. The electric field between the disks is 4.50×105 V/m . A) What is the voltage across the capacitor? Express your answer to two significant figures and include the appropriate units. B) An electron is launched from the negative plate. It strikes the positive plate at a speed of 2.00×107 m/s . What was the electron's speed as it left the negative plate? Express your answer to two significant figures and include the appropriate units.

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