"K1TTT" wrote
...
On May 11, 4:26 am, "Szczepan Bialek" wrote:

But the source of sound is an increase of the pressure.
The source of electric waves is an increase of the voltage.

The voltage increases at the ends of a dipole.

The electric waves and sound propagate in metal wires, but with
different
speeds.
Are electric waves in a wire also transversal?
yes.

" As the wave propagates along the line, it is accompanied by currents
which
flow longitudinally in the conductors".
From:http://www.answers.com/topic/electro...e-transmission

In reality no pure transversal waves. Such are only possible in the math.
S*

but as dilbert's trolls know, numbers create reality, not the other
way around. if you can't describe it in a formula, it can't exist.
and yes, while the current moves longitudinally along the wire, the
fields are transverse. look at the formulas, they apply to the wire
also. they just get more complex because you have to take into
account the boundry conditions at the interface between the wire and
what is around it... something that freshman physics and calculus are
not enough to handle.

You all time about Maxwell's hypothesis. But Maxwell wrote: "The general
type of a stress is not suitable as a representation of a magnetic force,
because a line of magnetic force has direction and intensity, but has no
third qufility indicating any difference between the sides of the line,
which would be analogous to that observed in the case of polarized
light[2]." From: http://en.wikisource.org/wiki/On_Phy...Lines_of_Force

To explain the light polarization Maxwell assumed that the current in the
wire create the magnetic whirl around the wire (The same for displacement
current in the space).

Maxwell's waves are polarized. Now you know that the dipoles are "polarized"
(not waves).
S*