[Physics] EM waves

Fri Dec 1 20:39:12 CET 2017

Dear Randy,

>>>>>Maxwell made a simplification that makes no sense to take seriously in
terms of mechanism.

Saying that Maxwell"s simplification makes no sense is ok. But saying that
it should not be taken seriously sound a bit unreasonable. Possibly (div
E=0) carry some special meaning in physical context and not absence of
source.

Every wave has a time period T. What would be the nature and properties of
wave with a time period equal to the Age of the Universe?

Actually there are many issues about Electricity and Magnetism, which still
makes limited sense, particularly the unit of Electrical Charge itself.

We have never directly detected the charge except by measuring the
force(which can easily be expressed in terms of kg, meter and second)
between current carrying conductors. So why do we have a new unit of charge
called Coulumb. Is it only because, in early nineties, square root of mass
and square root of length made no sense? Or possibly it was difficult
assign a physical meaning to square of a second?

We have accepted that time as a physical parameter is same like space, so
we call it space-time? Therefore, if square of a length means area, then
why can't square of a second have similar meaning? I am really interested
to know that why it does not makes sense , if so?

Regards,

Tufail Abbas.

On 1 Dec 2017 8:01 pm, "Randy O. Wayne" <row1 at cornell.edu> wrote:

Dear Art,
The E and B are only in phase when there is no source of the wave (div E =
0). Because there is always a source of the waves div E > 0 (as you see in
antennas). Maxwell made a simplification that makes no sense to take
seriously in terms of mechanism.
I ended my class today with two quote from Maxwell:
I hope that I have fulfilled James Clerk Maxwell's goal as a teacher. He
wrote, "In this class, I hope you will learn not merely results, or
formulae applicable to cases that may possibly occur in our practice
afterwards, but the principles on which those formulae depend, and without
which the formulae are mere mental rubbish. I know the tendency of the
human mind is to do anything rather than think. But mental labour is not
thought, and those who have with labour acquired the habit of application
often find it much easier to get up a formula than to master a principle."
And
Maxwell also wrote, "My duty is to give you the requisite foundation and to
allow your thoughts to arrange themselves freely. It is best that every man
should be settled in his own mind, and not be led into other men's ways of
thinking under the pretence of studying science. By a careful and diligent
study of natural laws I trust that we shall at least escape the dangers of
vague and desultory modes of thought and acquire a habit of healthy and
vigorous thinking which will enable us to recognise error in all the
popular forms in which it appears and to seize and hold fast truth whether
it be old or new."
Thanks,
Randy

Randy Wayne,
Providing a Second Opinion on Scientific Issues Since 1982

http://labs.plantbio.cornell.edu/wayne/

-----Original Message-----
From: Physics [mailto:physics-bounces at tuks.nl] On Behalf Of Hans van Leunen
Sent: Friday, December 1, 2017 10:06 AM
To: General Physics and Natural Philosophy discussion list <physics at tuks.nl>
Subject: Re: [Physics] EM waves

This only happens in conditions in which the total change of the underlying
field equals zero. It is a general feature of all basic fields. See The
Mother of all Field Equations. http://vixra.org/abs/1709.0324 Greetings,
Hans
>----Origineel Bericht----
>Van : art at funkhouser.ch
>Datum : 01/12/2017 15:49
>Aan : physics at tuks.nl
>Onderwerp : [Physics] EM waves
>
>Hi,
>
>When I first learned about E and B fields, I was told that the E field
>is at its maximum when the B field is changing the most rapidly.
>
>And the same for the B field.
>
>This would imply that the E and B vectors in a plane polarized EM wave
>would be shifted 90° in phase.
>
>Maxwell's equations, though, predict that they would be in phase (i.e.,
>no phase shift).
>
>If the energy of an EM wave is proportional to E^2 (also to B^2), then
>it (the energy) would be pulsed (if they are in phase).
>
>Apparently EM waves start out from an antenna with a 90° phase shift
>(near field) and are later in phase (far field).
>
>As the EM wave proceeds from the near field to the far field, the E
>vector and the B vector must slowly shift phase in order to end up
>being in phase.
>
>At some time this must have been experimentally verified.
>
>Can someone point me to the paper (maybe even in the 1800s) where this
>was shown to be true?
>
>Or later replication(s)?
>
>Thank you.
>
>Best,
>
>Art Funkhouser, Bern, Switzerland
>
>
>
>
>
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