Hi I just read this in an introductory physics book "However, a spinning ball of charge would violate the laws of relativity and other physical laws." It was in a section on electron "spin". Is that true? Couldn't I take a metal ball and put some charge on it and spin it up? Would the centripetal acceleration of the ball cause it to slow down because of the emission of EM radiation? Would the ball really stop or just slow down? Even if that's the case, what does that have to do with relativity? Or should I be thinking general? Help!!