Re: How does a Faraday disk really work?

On 7 Aug, 06:23, Salmon Egg <Salmon...@[EMAIL PROTECTED]
> wrote:
> In article
> <a54b9a58-5c3f-42db-8baa-9ba93b4c5...@[EMAIL PROTECTED]
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> =A0blackhead <larryhar...@[EMAIL PROTECTED]
> wrote:
>
> > But the Lorentz Law is a special case of Faraday's Law in differential
> > form when B is time independent. I don't understand where you're
> > getting this idea from that Maxwell's equations aren't sufficient to
> > explain the Faraday generator.
>
> > Title:
> > =A0A Simple Proof that the Lorentz Force, Law Implied Faraday's Law of
> > Induction, when B is Time Independent
>
> >http://adsabs.harvard.edu/abs/1973AmJPh..41..713D
>
> > Deriving the Lorentz force equation from Maxwellapos;s equations
>
>http://ieeexplore.ieee.org/Xplore/login.jsp?url=3D/iel5/7814/21481/0099.=
...
> > temp=3Dx
>
> The only possible Maxwell equation in differential form that describes
> Faraday induction must be:
>
> curl E =3D - B/ t =A0{partial of B wrt t if symbols don't show}
>
> This seems useless if B does not vary with time.

huh?

(@[EMAIL PROTECTED]
 - @[EMAIL PROTECTED]
)i =3D 0
(@[EMAIL PROTECTED]
 - @[EMAIL PROTECTED]
)j =3D 0
(@[EMAIL PROTECTED]
 - @[EMAIL PROTECTED]
)k =3D 0

I don't see how these equation are useless just because there's a 0 on
the RHS

> The references also seem of little value. I might be able to dig up th
> Harvard reference at a local university library. Its title is so
> ungrammatical as to be of no value.
>
> Even though I am an IEEE member, I am not about to spend the money for a
> subscription.
>
> It seems clear to me that special relativity is the easy approach to
> flux "cutting." I just do not see flux cutting arising from the Maxwell
> equation. I am beginning to believe that using the Lorentz force as a
> law by itself is a back road to describe relativity.
>
> Where do we go from here?

Maxwell's equations can be derived from Coulomb's Law, Special
Relativity and Hamilton's principle if you want to look at
fundamentals:

http://arxiv.org/abs/physics/0501130

"Flux cutting" and "tubes of flux" are pictures that were created by
Faraday around 200 years ago and are no longer a cutting edge
explanation of electromagnetism nowadays, even though still widely
practised by engineers.


> Bill- Hide quoted text -
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