Download or read book Toroidal Multipole Moments in Classical Electrodynamics written by Stefan Nanz and published by Springer. This book was released on 2016-02-05 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stefan Nanz investigates the necessity for three multipole families in classical electrodynamics. He shows that by imposing symmetry and parity constraints, it is sufficient to deal with only two multipole families. This implies that the toroidal multipole moments do not represent an independent multipole family, and they only emerge in the long-wavelength limit.