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A horizontal beam of electrons initially moving at 3.3 107 m/s is deflected vertically by the vertical electric field between oppositely charged parallel plates as shown in the diagram. The magnitude of the field is 1.70 104 N/C. (b) What is the charge per unit area on the plates? (c) What is the vertical deflection d of the electrons as they leave the plates? length is two centimeters

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