A very long uniform line of charge has charge per unit length 3.90 µC/m and lies along the x-axis. A second long uniform line of charge has charge -2.25 µC/m per unit length and is parallel to the x-axis at y = 0.400 m. What is the net electric field (magnitude and direction) at the following points on the y-axis? (a) y = 0.200 m (b) y = 0.600 m