Four Poynting Theorems

Autor/inn/en	Kinsler, Paul; Favaro, Alberto; McCall, Martin W.
Titel	Four Poynting Theorems
Quelle	In: European Journal of Physics, 30 (2009) 5, S.983-993 (11 Seiten) PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0143-0807
DOI	10.1088/0143-0807/30/5/007
Schlagwörter	Physics; Energy; Algebra; Geometric Concepts; Equations (Mathematics) + Suchen Sie Ihr Suchwort? Physik; Energie; Elementare Geometrie; Equations; Mathematics; Gleichungslehre
Abstract	The Poynting vector is an invaluable tool for analysing electromagnetic problems. However, even a rigorous stress-energy tensor approach can still leave us with the question: is it best defined as E x H or as D x B? Typical electromagnetic treatments provide yet another perspective: they regard E x B as the appropriate definition, because E and B are taken to be the fundamental electromagnetic fields. The astute reader will even notice the fourth possible combination of fields, i.e. D x H. Faced with this diverse selection, we have decided to treat each possible flux vector on its merits, deriving its associated energy continuity equation but applying minimal restrictions to the allowed host media. We then discuss each form, and how it represents the response of the medium. Finally, we derive a propagation equation for each flux vector using a directional fields approach, a useful result which enables further interpretation of each flux and its interaction with the medium. (Contains 3 footnotes and 1 table.) (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10