May 2008
Intermediate to advanced
340 pages
9h 41m
English
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A.1 INTRODUCTION
All macroscopic electromagnetic phenomena are described by Maxwell's equations. The equations express the distributed nature of the electromagnetic fields; the field quantities are functions of space as well as time.
Faraday's law relates the electromotive force, generated around a closed contour C, to the time rate of change of the total magnetic flux through the open surface S bounded by that contour. Or in other words: Faraday's law shows that a time-changing magnetic flux can induce an electric field:
E the electric field intensity vector [V/m]
B the magnetic flux density vector [Wb/m2]
Ampère's law states the opposite: a time-changing electric flux can induce a magnetic field:
H the magnetic field intensity vector [A/m]
J the current density vector [A/m2]
D the electric flux density vector [C/m2]
Gauss' law for the electric field states that the net flux of the electric flux density vector out of the closed surface S is equivalent to the net positive charge enclosed by the surface:
ρ the volume-free charge density [C/m3]
Sections A.2 to A.5 are based on Chapter 9 of Leonard M., Magid, Electromagnetic Fields, Energy and Waves, John Wiley & Sons Inc., New York, ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.