9. Consider two infinite planes of charge. One coincides with the x-y plane and has charge density of +7.2 x 10-12 C/m2. The second plane coincides with the y-z plane

and has a charge density of -4.2 x 10-12 C/m2. Calculate the magnitude of the electric field, in N/C, at any location that is not on the x-y or y-z planes. Use ɛ0 = 8.9 x 10-12 F/m.