Re: Displacement Current Demonstration

Hello Benj...

The simple answer seems to be, no. There have been many attempts to
demonstrate the interpretation that Displacement Current leads directly to a
magnetic field. None have proven it. The most exhaustive used cryogenics to
attempt to prove the Displacement Current--->H idea. It failed to do so.
(Sorry, I don't have the reference handy.)

An excellent overview of Displacement Current is Roche's "The presen status
of Maxwell's displacement current." Eur. J. Physics 19(1998) The
bibliography is rich. Also see WGV Rosser's book, "Classical
Electromagnetism via relativity." On page 81, after analyzing the magnetic
field of a moving "point" charge, he says, "The Maxwell term (What he calls
Displacement Current) the magnetic field at P... both the electric and
magnetic fileds ... arise from the moving charge."

Rosser says lots more.

Unfortunately, textbooks have ignored all of this, and every online EM
syllabus that I have seen persists with the myth of Displacement Current.

I hope this helps.

Bill


"Benj" <bjacoby@xxxxxxxxxxx> wrote in message
news:1173853609.139875.175500@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Here's a simple question.

In Elecromagnetics there are lots of relatively simple experiments
that can demonstrate the various principles and fields.

But I've never seen one that can directly demonstrate a displacement
current. The usual argument seems to be that since the displacement
current hypothesis is necessary for Maxwell's equations to predict
electromagnetic radiation and since said radiation is known to exist,
therefore we doan need no steenkin' direct demonstration of a
displacement current.

Does anybody here know of any direct experimental demonstration be it
simple or complex of the existence of a true displacement current.
Even a reference to a paper where someone has done it?

Benj



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