# Electromagnetic - PowerPoint PPT Presentation

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## Electromagnetic

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### Title: Electromagnetic Discontinuities Must Propagate at a speed Author: James Thomas Last modified by: James Thomas Created Date: 5/4/2010 7:29:25 PM – PowerPoint PPT presentation

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Title: Electromagnetic

1
Electromagnetic Discontinuities Must Propagate
at a speed
2
(No Transcript)
3
Our wavefront satisfies both Gausss
laws because there is no enclosed charge or
current, and fields on opposite sides of the box
are the same.
4
There is a changing B flux as the wavefront moves
by. This changing flux must be equal to the line
integral of the E field. Only the back edge (gh)
contributes to this line integral.
5
There is a changing E flux also. This gives
another reqd relation between E and B.
6
ch.edu/phys1/java/phys1/MovingCharge/MovingCharge
.html
7
8
Coulombs law cant describe the kinked E
field. We got it from connecting field lines
geometry. However, we do get the kinked field if
we consider the potential.Potential
depends only on where the charge was and how
fast it was moving a time r/c ago. (In other
words, we have to account for the light travel
time.)(we will need to do better than just the
scalar electric potential, though)
9
But whats it good for?