(Solved): 4. (25p) Two large parallel plates are positioned facing each other with uniform surface charge dens ...

4. (25p) Two large parallel plates are positioned facing each other with uniform surface charge densities: \( +\sigma \) on the top plate and \( -\sigma \) on the bottom plate. Calculate the electric field in all regions. (Use Gauss's Law to justify your results and clearly indicate the direction of the electric field in each region.)