[Physics] EM waves

[Randy O. Wayne]

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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