Re: [Phys-l] Poynting Vector

[Jack Uretsky <jlu@hep.anl.gov>]

As Curt suggests, this sounds like a static situation.  If so, there is no 
EM wave, and, consequently, no Poynting vector.
	Regards,
		Jack



On Sat, 28 Jun 2008, chuck britton wrote:

> This is an excellent question.
> Let's keep it simple - steady state no external circuits etc.
>
> I'll suggest that we make it more real and less ideal using a simple
> dipole to replace the capacitor.
>
> Keep the positive point charge on the left etc.
>
> Now look at the Poynting vector at locations other than directly
> between the point charges.
>
> Power is conserved
>
> What is circulating besides electrical power??
>
> Maybe the Vector Potential comes into play??
>
> What about angular momentum?
>
>
>
> On Jun 28, 2008, at Jun 28(Sat) 12:48 , Jeffrey Schnick wrote:
>
> > Consider a charged simple parallel plate capacitor in a static uniform
> > downward-directed magnetic field.  The capacitor is oriented so that
> > from our point of view, the electric field between the plates of the
> > capacitor is directed rightward.  Poynting tells us that between the
> > plates, energy is flowing away from us at a rate proportional to EB.
> > Where is that energy coming from and going to?
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