What's the Use of Bound Charge?
arXiv:1506.02590
Abstract
Bound charge is a useful construct for calculating the electrostatic field of polarized material, and it represents a perfectly genuine accumulation of charge. But is such a material in every respect equivalent to a particular configuration of bound charge? The answer is no, and the same goes for bound current and (in the time-dependent case) polarization current.
Introduction re-written, references in endnote 4 added, some oversights corrected (in Eq. 9 and similar equations); 8 pages