I have read that in electrostatic equilibrium, their are no electric fields or else the charges would be moving. So given a positively charged spherical shell, the positive charges would repel each other and reside on the outside, causing the shell to be in electrostatic equilibrium. But if we now put a positively charged particle in the inside the shell, some negative charges from the shell would gather on the inner lining of the shell thus making a same amount of positively charged particles reside on the outermost part of the shell. What about the remaining initial positive charge? Does it reside on the outermost lining of the shell because the charges repel each other (ie. charges in a conductor gather as far away from each other on the lining of the conductor), or are they attracted towards the inner side of the shell because the negative charges already there attract them and the positive charges already on the outside repel them? I hope my question makes sense. This is not exactly a "homework problem", but a question arising from a problem.