An infinitely long line of charge has linear charge density 5.00×10−12 C/m5.00×10−12 C/m. A proton (mass 1.67×10−27 kg1.67×10−27 kg, charge +1.60×10−19 C+1.60×10−19 C) is 18.0 cm from the line and moving directly toward the line at 3.50×103 m/s.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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