3. Imagine a cubic surface whose faces are in the planes x = 0, y = 0, z =0, x = 1.50 m, y = 1.50 m, and z = 1.50 m. a. Find the electric flux through this surface for E = 3.00 NC-1 y, where m is a metre. m b. Find the electric flux through this surface for E = -4.00 NC-x+ 6.00 NC-1 + 3.00 NC-1 y. c. In each case, how much charge is inside the cube