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An infinitely long line of charge has linear charge density 5.00 × 10−12 C/m. A proton (mass 1.67 × 10−27 kg, charge + 1.60 × 10−19C) is 18.0 cm from the line and moving directly toward the line at 3.50 × 103 m/s. (a) Calculate the proton’s initial kinetic energy. (b) How close does the proton get to the line of charge?
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