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Electric Fields in Capacitors
24. Electric Force & Field; Gauss' Law / Electric Fields in Capacitors / Problem 3

Two electrodes with a separation distance of 3.0 cm have an electric field strength of 3.0 × 104 N/C between them. A proton is released from the negative plate at a 30° angle with respect to the horizontal. Find the maximum initial speed that the proton must have in order to just barely miss hitting the positive plate.
Diagram showing two electrodes with a proton's trajectory at 30° in an electric field.

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