The box-like Gaussian surface of the figure encloses a net charge of 20.0ε0 C and lies in an electric field given by E→ = [(11.0 + 3.40x)i^ − 4.50j^ + bzk^] N/C with x and z in meters and b constant. The bottom face is in the xz plane; the top face is in the horizontal plane passing through y2 = 1.00 m. For x1 = 1.80 m, x2 = 4.80 m, z1 = 1.90 m, and z2 = 3.90 m, what is b? Number Units