Open main menu
Home
Random
Recent changes
Special pages
Community portal
Preferences
About Wikipedia
Disclaimers
Incubator escapee wiki
Search
User menu
Talk
Dark mode
Contributions
Create account
Log in
Editing
Poynting vector
(section)
Warning:
You are not logged in. Your IP address will be publicly visible if you make any edits. If you
log in
or
create an account
, your edits will be attributed to your username, along with other benefits.
Anti-spam check. Do
not
fill this in!
==Resistive dissipation== If a conductor has significant resistance, then, near the surface of that conductor, the Poynting vector would be tilted toward and impinge upon the conductor.<ref name="Boule2024" />{{rp|at=figs.7,8}} Once the Poynting vector enters the conductor, it is bent to a direction that is almost perpendicular to the surface.<ref name="Harrington2001">{{cite book | last = Harrington | first = Roger F. | year = 2001 | title = Time-Harmonic Electromagnetic Fields | edition = 2nd | publisher = McGraw-Hill | isbn = 978-0-471-20806-8 | url = https://books.google.com/books?id=4-6kNAEACAAJ |author-link=Roger F. Harrington }}</ref>{{rp|p=61}} This is a consequence of [[Snell's law]] and the very slow speed of light inside a conductor. The definition and computation of the speed of light in a conductor can be given.<ref name="Hayt2011">{{cite book | last = Hayt | first = William | title = Engineering Electromagnetics | edition= 4th | publisher = McGraw-Hill | place = New York | year = 2011 | isbn = 978-0-07-338066-7 | url = https://books.google.com/books?id=XeaHcgAACAAJ }}</ref>{{rp|p=402}} Inside the conductor, the Poynting vector represents energy flow from the [[electromagnetic field]] into the wire, producing resistive [[Joule heating]] in the wire. For a derivation that starts with Snell's law see Reitz page 454.<ref name="Reitz2008">{{cite book | last1 = Reitz | first1 = John R. | last2 = Milford | first2 = Frederick J. | last3 = Christy | first3 = Robert W. | title = Foundations of Electromagnetic Theory | edition = 4th | publisher = Addison-Wesley | place = Boston | year = 2008 | isbn = 978-0-321-58174-7 | url = https://books.google.com/books?id=PYYSplKkBOoC }}</ref>{{rp|p=454}}
Edit summary
(Briefly describe your changes)
By publishing changes, you agree to the
Terms of Use
, and you irrevocably agree to release your contribution under the
CC BY-SA 4.0 License
and the
GFDL
. You agree that a hyperlink or URL is sufficient attribution under the Creative Commons license.
Cancel
Editing help
(opens in new window)