3. A cubical Gaussian surface encloses a net charge. Eachedge of the cube has length 4.0 m. The cube is drawn such that fourof its six faces are parallel to the z direction. The net electricfield is such that the electric field lines skim each of these fourfaces. On the top face, the electric field ?⃗⃗ ? = +25?̂ N/C and onthe other face ?⃗⃗ ? = −40?̂ N/C. Sketch the cubical Gaussiansurface, indicating the z direction, ?⃗⃗ ? and ?⃗⃗
a. Determine the net charge the Gaussian surface encloses.b) Would any of your calculations be affected if you useda spherical Gaussian surface instead of a cubical one? Justify youranswer.
