An infinite plane of charge with surface charge density ?1 = 3.7 µC/m2 is parallel to the xz plane at y = -0.8 m. A second infinite plane of charge with surface charge density ?2 = -1.1 µC/m2 is parallel to the yz plane at x = 1 m. A sphere of radius 1 m with its center in the xy plane at the intersection of the two charged planes (x = 1 m, y = -0.8 m) has a surface charge density ?3 = -4.5 µC/m2. Find the magnitude and direction of the electric field at the following locations on the x axis.
(a) x = 0.4 m
E =_________?______________ N/C