On Nov 20, 11:30*am, (Richard Harrison)
wrote:
Art wrote:

"I am not saying that displacement current travels in the center but I
ask those educated in this field if displacement current has been
observed, measured and is present Beyond Doubt?"

Yes.

Displacement current is proportional to the rate of change of the
electric field. It moves at right angles to the direction of
propagstion.

Like charges repel without electrical conduction so a capacitor passes
ac while blocking dc.

A standing wave antenna stores energy in the magnetic field near its
center during one half of the cycle and in the electric fields near its
ends during the other half cycle.

Dielectric displacement is the electrical strain which occurs in a
dielectric medium when an electric field is applied. It is analogous to
the magnetic flux density and is expressed in charge per unit area or
coulombs per aquare meter.

J.C. Maxwell speculated displacement current produces magnetic lines of
force same as conduction current does, therefore an alternating magnetic
field would produce an alternating electric field and so on ad
infinitum. This was the key to electromagnetic radiation. Hertz later
proved Maxwell correct in the laboratory.

Best regards, Richard Harrison, KB5WZI *

Now why did I expect such an answer from you? The Physics World states
that displacement current does not exist
with respect to radiation and you hang on to outdated books and sneer
at modern day advances
Seems like you will never ever accept change

Art wrote:
"The Physics World states that displacement current does not exist with
respect to radiation---."

Who and where?

Be reasonable. Free space is normally nonconductive. It is a good
insulator or dielectric. Light is by all accounts an electrromagnetic
radiation. We readily see light from sources throughout space.

Michael Faraday (1791- 1867) wrote:
E = F/Q where E & F are parallel vectors. E = the electric field
strength in force per unit charge and F is measured in newtons per
coulomb.

Electric charges` force on each other are readily measured. Likewise,
magnetic forces` influence on each other and upon electric charges are
readily measured.

Radio waves as Terman says:
"---travel with the speed of light and consist of magnetic and
electrostatic fields at right angles to each other and to the direction
of travel."

Electrostatic does not mean stationary.

There are no conductors in space suited to support an electric current
for wave propagation, therefore it is the invisible but readily
measurable electric and magnetic fields which invoke action at great
distances.

Best regards, Richard Harrison, KB5WZI

"Richard Harrison" wrote in message
...
Art wrote:
"The Physics World states that displacement current does not exist with
respect to radiation---."

Who and where?

Be reasonable. Free space is normally nonconductive.

remember, art believes space is full of magic jumping diamagnetic levitating
neutrinos, obviously they carry the charge so there is no need for
displacement current, only the weak force.

On Nov 21, 1:28*pm, "Dave" wrote:
"Richard Harrison" wrote in message

...

Art wrote:
"The Physics World states that displacement current does not exist with
respect to radiation---."

Who and where?

Be reasonable. Free space is normally nonconductive.

remember, art believes space is full of magic jumping diamagnetic levitating
neutrinos, obviously they carry the charge so there is no need for
displacement current, only the weak force.

Not so. I am willing to believe what modern science say that the
aether is filled with
a circulating magnetic field thru which particles can pass. If that is
what they think that is fine by me.
After all there must be something inside the arbritary border of the
Aether to prevent it collapsing per Newton
Art

I wrote:
"---electric and magnetic fields which invoke action at great
distances."

I now think "evoke" should have been used in place of "invoke".

Best regards, Richard Harrison, KB5WZI

Richard Harrison wrote:

...
I now think "evoke" should have been used in place of "invoke".

Best regards, Richard Harrison, KB5WZI


Richard:

I am sure there is, most-probably, enough difference for argument ...

However, to a poor country boy like myself, these terms are, for the
most part, interchangeable ... both can be found with definitions which
bring "magic", "mystery" and the "spiritual realm" into mind ... and, I
am sorry, sometimes I "just feel" this way (and, especially when it is
the "wifes time of the month!") ... grin

Sorry, just thought a bit of sick humor might be appreciated by some ...
LOL! and-a-evil-grin

Regards,
JS

On Nov 21, 4:03*pm, John Smith wrote:
Richard Harrison wrote:
...
I now think "evoke" should have been used in place of "invoke".

Best regards, Richard Harrison, KB5WZI

Richard:

I am sure there is, most-probably, enough difference for argument ...

However, to a poor country boy like myself, these terms are, for the
most part, interchangeable ... both can be found with definitions which
bring "magic", "mystery" and the "spiritual realm" into mind ... and, I
am sorry, sometimes I "just feel" this way (and, especially when it is
the "wifes time of the month!") ... grin

Sorry, just thought a bit of sick humor might be appreciated by some ...
LOL! *and-a-evil-grin

Regards,
JS

No JS THEY ARE NOT INTERCHANGEABLE
You can't insert units that state it is a current and
in the same breath say it does not produce a magnetic field
Best regards
Art

Art Unwin wrote:

...
No JS THEY ARE NOT INTERCHANGEABLE
You can't insert units that state it is a current and
in the same breath say it does not produce a magnetic field
Best regards
Art

Interesting ...

EVOKE:
# arouse: call forth (emotions, feelings, and responses); "arouse pity";
"raise a smile"; "evoke sympathy"
# provoke: evoke or provoke to appear or occur; "Her behavior provoked a
quarrel between the couple"
# educe: deduce (a principle) or construe (a meaning); "We drew out some
interesting linguistic data from the native informant"
# raise: summon into action or bring into existence, often as if by
magic; "raise the specter of unemployment"; "he conjured wild birds in
the air"; "call down the spirits from the mountain"
# suggest: call to mind; "this remark evoked sadness"
wordnet.princeton.edu/perl/webwn

INVOKE:
# raise: summon into action or bring into existence, often as if by
magic; "raise the specter of unemployment"; "he conjured wild birds in
the air ...
# cite as an authority; resort to; "He invoked the law that would save
him"; "I appealed to the law of 1900"; "She invoked an ancient law"
# appeal: request earnestly (something from somebody); ask for aid or
protection; "appeal to somebody for help"; "Invoke God in times of trouble"
wordnet.princeton.edu/perl/webwn

Gee, I am "feeling for you", just can't "reach you", but then, you
already knew that ... :-(

Regards,
JS

Richard Harrison wrote:
Michael Faraday (1791- 1867) wrote:
E = F/Q where E & F are parallel vectors. E = the electric field
strength in force per unit charge and F is measured in newtons per
coulomb.

Faraday should have written that E is in units of newtons per coulomb,
as F would obviously be in newtons.

Electrostatic does not mean stationary.

In what way does it not?

73, ac6xg

Jim Kelley wrote:
"In what way is it (an electrostatic field) not (stationary)?"

Terman was refering to an electromagnetic (radio) wave. It is a
peculiarity of "old-speak" to call an electric field an electrostatic
field.

As Cecil reminds us, radio waves are always in motion. But, their
superposition may produce a stationary wave called a standing wave.

Best regards, Richard Harrison, KB5WZI