Three infinite lines of charge, pl = 3 (nC/m), Pl = 3 (nC/m), and Pl3 = 3 (nC/m), are all parallel to the z-axis. If they pass through the respective points (0, -b), (0,0), and (0,6) in the x-y plane, find the electric field at (a,0,0). Evaluate your result for a = 2 cm and b = 1 cm.