I think now that it does.
Simple experiments, performed by Oleg D. Jefimenko and others
have shown electric field-lines around the wiring of some electric
circuits.
(see references in 'The electric force of a current" by A.K.T. Assis
and
J.A.Hernandes ).
These force-field lines are different from the ones that would exist
if
no current is flowing through the circuit.

Interestingly, O.d. Jefimenko does not consider the current as a
source of electric field.
He mentions 3 sources of an electric field : 1. charge density
2.the
time derivative of charge density
3.the
time derivative of current density J
My question is meant for those who are familiar with the mentioned
authors'
approach to the theory of electromagnetism.

Ch2 in Assis has some nice figures showing the kind of surface charge
distributions one would expect. He is correct to point out that there must
be a component of the Poynting vector parallel to the wire, as well as the
more commonly mentioned perpendicular component of the Poynting vector. If
there were not, how could energy travel from the power supply to outside
some part of the wire in order to move into it?

On Tue, 4 Mar 2008, xray4abc wrote:
I think now that it does.
Simple experiments, performed by Oleg D. Jefimenko and others
have shown electric field-lines around the wiring of some electric
circuits.
(see references in 'The electric force of a current" by A.K.T. Assis
and
J.A.Hernandes ).
These force-field lines are different from the ones that would exist
if
no current is flowing through the circuit.

I wouldn't put it that way around, but would instead say that an electric
field is needed to create an electric current.

Ch2 in Assis has some nice figures showing the kind of surface charge
distributions one would expect. He is correct to point out that there must
be a component of the Poynting vector parallel to the wire, as well as the
more commonly mentioned perpendicular component of the Poynting vector. If
there were not, how could energy travel from the power supply to outside
some part of the wire in order to move into it?

Interestingly, O.d. Jefimenko does not consider the current as a
source of electric field.
He mentions 3 sources of an electric field : 1. charge density
                                                               2.the
time derivative of charge density
                                                               3.the
time derivative of current density J
My question is meant for those who are familiar with the mentioned
authors'
approach to the theory of electromagnetism.

It's just a case of 1, the surface charge density (again, well-illustrated
in Assis). Current in a resistive circuit doesn't just flow by itself.

--
Timo Nieminen - Home page:http://www.physics.uq.edu.au/people/nieminen/
E-prints:http://eprint.uq.edu.au/view/person/Nieminen,_Timo_A..html
Shrine to Spirits:http://www.users.bigpond.com/timo_nieminen/spirits.html

I think now that it does.
Simple experiments, performed by Oleg D. Jefimenko and others
have shown electric field-lines around the wiring of some electric
circuits.
(see references in 'The electric force of a current" by A.K.T. Assis
and
J.A.Hernandes ).
These force-field lines are different from the ones that would exist
if
no current is flowing through the circuit.
Interestingly, O.d. Jefimenko does not consider the current as a
source of electric field.
He mentions 3 sources of an electric field : 1. charge density
2.the
time derivative of charge density
3.the
time derivative of current density J
My question is meant for those who are familiar with the mentioned
authors'
approach to the theory of electromagnetism.
Regards, LL

Hi

This is a interesting question I have been speculating about.

I hadn't read Assis and Hernandes,
so the source of my speculation is from page 30 inhttp://www.scribd.com/doc/4445/quaternionic-electrodynamics

The vector part of eq. (4.4) reads

p[1]rp[2] + j[1]x(rxj[2]) - j[1](rj[2]) + p[1](rxj[2]) + (j[1]xr)p[2]

Here the first 2 parts is normal Grassmann force the 3rd part explain
the longitudinal force.

The 2 last parts is the antisymmetric parts which disappear when the
quaternionic equation is written like in (3..

But this a those parts which is important in this discussion,
the first part  p[1](rxj[2]) describes a force on a free charge by the
magnetic field, such that it would move along the magnetic field lines.
The second part (j[1]xr)p[2] says that there is force on a current
moving in a electric field.

a example is that if a current moves in the direction of a electric
field and the current have a small perpendicular component then the
current will start spinning around a axis parallel to the electric field
which way it spins depend of the initial direction of the small
perpendicular component.

This could maybe explain the origin of the electrons spin.



xray4abc wrote:
I think now that it does.
Simple experiments, performed by Oleg D. Jefimenko and others
have shown electric field-lines around the wiring of some electric
circuits.
(see references in 'The electric force of a current" by A.K.T. Assis
and
J.A.Hernandes ).
These force-field lines are different from the ones that would exist
if
no current is flowing through the circuit.
Interestingly, O.d. Jefimenko does not consider the current as a
source of electric field.
He mentions 3 sources of an electric field : 1. charge density
                                                               2.the
time derivative of charge density
                                                               3.the
time derivative of current density J
My question is meant for those who are familiar with the mentioned
authors'
approach to the theory of electromagnetism.
Regards, LL- Hide quoted text -

- Show quoted text -