Experimental evidence for v > c in case of Coulomb interaction

>> = Wolfgang G. Gasser in news:f7182t$kvd$[Only registered users see links. ]-plus.net


This may be the case, but using "standing waves" does not help
very much. A single-shot event such as a spark leading to a
substantial charge transfer is much more appropriate to measure
propagation speed. The oscillations emerging in the spheres
(the direction of the current in the spark can change) also
suggest instantaneity of the Coulomb interaction. But such
an 'apparent instantaneity' has already been found by Heinrich
Hertz before he succeeded to detect transversal radiation. See:
[Only registered users see links. ]

See also:
[Only registered users see links. ]




"Suppose that a charge comes into existence for a period of time,
emits a Coulomb field, and then disappears. Suppose that a
distant charge interacts with this field, but is sufficiently
far from the first charge that by the time the field arrives the
first charge has already disappeared. The force exerted on the
second charge is only ascribable to the electric field: it
cannot be ascribed to the first charge, because this charge no
longer exists by the time the force is exerted. The electric
field clearly transmits energy and momentum between the two
charges."

This reasoning once again ignores the huge fundamental difference
between purely electric or purely magnetic interaction and e.m.
transversal radiation. A sudden disappearance of an emitter has
no influence at all on the radiation already emitted, nor has
the reception of radiation by a receiver any retroaction on the
emitter, becaue emitter and receiver are not linked by Newton's
third law. Also, the emitter of e.m. radiation loses energy, and
without an energy supply, the emitter cannot radiate (steadily).

Yet in the case of a charge, the field is independent of an
energy supply. Neither the charge nor its electr(ostat)ic field
can suddenly disappear*. A measurable effect on a second charge
is impossible without a retroeffect on the first charge, because
both charges are directly linked by Newton's third law.

"Let us now consider a moving charge. Such a charge is continually
emitting spherical waves in the scalar potential, and the
resulting wavefront pattern is sketched in Fig. 38. Clearly, the
wavefronts are more closely spaced in front of the charge than
they are behind it, suggesting that the electric field in front
is larger than the field behind."

Fig. 38 elegantly shows the violation of Gauss' law for electricity
(Maxwell's first equation) stating that the electric flux out of
any closed surface is proportional to the total charge enclosed
within the surface. Imagine spheres of different radiuses with the
charge at the center and integrate the flux out of them. See also:
[Only registered users see links. ] (Infinite electric flux paradox).




Do you also take the fact that electromagnetic radiation can be
used to transfer information over huge distances for evidence that
the same can be done with purely electric fields?

Cheers, Wolfgang


* Nevertheless, it is possible to transfer an arbitrary amount of
charge over an arbitrary long distance in an arbitrarily short
period of time:

| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|o| |o| |o| |o| |o| |o| |o| |o| |o| |o| |o| |o| |o| |o| |o|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
+ - + - ... ... + -

A series of pairs of plates are set up in a line. The plates of
each pair are connected by a thyristor 'o'. The opposite plates of
each pair are inversely charged. When all thyristors are switched
on at the same time, the electrons move from the negative plates
to the postive ones. The fact that a thyristor is a semi-conductor
device prevents the electrons from oscillating between the plates.

Wolfgang G. Gasser schrieb:

Das ist doch Unsinn, ob man ein "pures" elektrisches Feld hat,
ist beobachterabhängig.
Wenn man Informationen übertragen will dann muss sich das Feld
ändern und dazu muss man die Ladungen beschleunigen. Es werden
also alle Beobachter wechselnde elektrische und magnetische
Felder beobachten.

Jens