I am wondering about why the electric field in a hollow sphere with charges on its surface would be zero. I have thought about the gaussian law argument for it. It only guarantees that the net number of electric field lines that pass the encloved surface are zero. But it says nothing about whether or not there are any field lines existing within it, only that theres a net of zero through any enclosed surface in the shell. The example I am thinking of is a shell of positive charges. The positive charges should all radiate an electric field in EVERY direction, so how could there be zero electric field lines at every point inside the shell.