An infinitely long line of charge has linear charge density 5.00×10−12c/m. a proton (mass 1.67×10−27 kg, charge +1.60×10−19
c) is 18.0 cm from the line and moving directly toward the line at 3.20×103m/s.
(a) calculate the proton's initial kinetic energy.
(b) how close does the proton get to the line of charge?