Re: experimental verification of electromagnetic mass
From: Satya Das (satyaranjandas77_at_yahoo.com)
Date: 08/28/04
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Date: Sat, 28 Aug 2004 09:35:38 +0000 (UTC)
"Andr? Michaud" <srp@microtec.net> wrote in message
news:562f286c.0408261312.4acee41e@posting.google.com...
>
>
> "Satya Das" <srdas@adobe.com> wrote in message
news:<2p2t7kFg5h1kU1@uni-berlin.de>...
> >
> > Does any one have a result of experimental verification of
> > electromagnetic mass?
>
> Absolutely. We have had them for more than 100 years.
>
> Walter Kaufmann has exhaustively explored the subject at the
> turn of the 20th century.
>
> See for example
>
> Uber die elektromagnetische Masse des Elektrons:
>
http://134.76.163.65/servlet/digbib?template=view.html&id=53031&startpage=325&endpage=330&image-path=http://134.76.176.141/cgi-bin/letgifsfly.cgi&image-subpath=/2026&image-subpath=2026&pagenumber=325&imageset-id=2026
>
> Or
>
> Die magnetische und elektrische Ablenkbarkeit der Bequerelstrahlen
> und die scheinbare Masse der Elektronen
>
http://134.76.163.65:80/servlet/digbib?template=view.html&id=52975&startpage=154&endpage=166&image-path=http%3A%2F%2F134%2E76%2E176%2E141%3A80%2Fcgi%2Dbin%2Fletgifsfly%2Ecgi%3Fimageset%3D%2F2025&image-subpath=2025&pagenumber=154&zoom-factor=null&imageset-
id=2025&hlinfo=640
>
> He wrote many other successive papers as he explored this subject, as
> he corrected and refined his experimental setup, that you can probably
> locate in the Göttingen U. archive.
>
> You can also have a look at this paper from Max Abraham who
> analyzed and integrated Kaufmann's work and concluded with
> him that his experiments established that mechanical mass per
> se is null and that the mass of electrons is exclusively of
> electrodynamic origin.
>
> Poincaré totally agreed with them and quotes their conclusion
> in many of his writings.
>
> The very precise experimentally measured mass of electrons is
> 9.10938188E-31 kg
>
> > Since the existence of electromagnetic mass means a non-zero
> > size of all charged particles,
>
> This (electrodynamic origin) does not mean that a stable measurable
> or meaningful "size" can be assigned to elementary particles.
>
> What radius would you assign to an eagle in full flight?
>
> Even if the electron physically was a localized standing EM compliant
> wave (or event) as was hypothesized by de Broglie, it would no doubt
> cyclically vary its local physical configuration in such a way that
> it would be impossible to assign a fixed radius.
>
> > then it must give the radius of charged particles. So what
> > is the size of electron, proton, and other particles?
>
> In the state of our current knowledge, electrons are experimentally
> verified to behave as point-like particles with apparently no
> possibility of assigning a meaningful radius to them.
>
> Protons on the other hand have a radius in the 10E-15 meter range,
> but protons are not elementary particles.
>
> Would you tell me where you read about electromagnetic mass?
>
> I am interested because I myself located no recent publication
> referring to the subject. Fallen in to momentary oblivion for
> lack of referencing, like so many other valuable research of
> the past.
The site that you mentioned is in German of which I do not know a bit. :(
I read about electromagnetic mass in Fynmann's Lectures on Physics.
It is a wonderfull book on physics and I guess everybody who has interest in
Physics read this.
If you have not read this, then read it. I am sure you will love it.
> André Michaud
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