Three infinite lines of charge, rhol1 = 3 (nC/m), rhol2 = −3 (nC/m), and rhol3 = 3 (nC/m), are all parallel to the z-axis. If they pass through the respective points (0,−b), (0,0), and (0,b) in the x–y plane, find the electric field at (a,0,0). Evaluate your result for a = 2 cm and b = 1 cm.