Re: Displacement Current Demonstration


Bill Miller wrote:
Hello Benj...

Hey Bill, Thanks for the help! I'd just about given up on any answers
here! I'll look up those references and I'm sure they'll help! If
displacement current can't be shown to exist, this is a biggie in that
the theory of EM radiation depends upon the idea. So if radiation
exists but a displacement current doesn't there are some serious
issues with Maxwell's equations!

I'll also comment on Rosser's comment that both electric and magnetic
fields (which is to say the displacement term) arise from the moving
charge. That's OK as far as it goes, but for EM propagation through
empty space, there would be no "point charge" present.

Thanks again!

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

.

Relevant Pages

  • Re: E=F/q=vB Magnetic Force does not work on the charge
    ... force is PERPENDICULAR to the velocity and hence to the displacement ... magnetic force also does not affect a perpendicularly moving charge, ... perpendicular, the dot product is always zero, and no work is ...
    (sci.physics.relativity)
  • Re: Is B just that part of E that does no work?
    ... Displacement current exists as a mathematical term @D/@dt = ... Displacement Current as a mathematical entity exists. ... charge configuration, you have to move what was static charge to new ... which means they will generate a magnetic field as they are ...
    (sci.physics.electromag)
  • Re: Is B just that part of E that does no work?
    ... Displacement current exists as a mathematical term @D/@dt = ... Displacement Current as a mathematical entity exists. ... charge configuration, you have to move what was static charge to new ... which means they will generate a magnetic field as they are ...
    (sci.physics.electromag)
  • Re: E=F/q=vB Magnetic Force does not work on the charge
    ... force is PERPENDICULAR to the velocity and hence to the displacement ... magnetic force also does not affect a perpendicularly moving charge, ...
    (sci.physics.relativity)
  • Re: E=F/q=vB Magnetic Force does not work on the charge
    ... force is PERPENDICULAR to the velocity and hence to the displacement ... magnetic force also does not affect a perpendicularly moving charge, ...
    (sci.physics.relativity)