Re: electrons & magnetic fields, a puzzle

From: Old Man (nomail_at_nomail.net)
Date: 01/01/05 

Date: Fri, 31 Dec 2004 20:56:25 -0600

"Androcles" <dummy@dummy.net> wrote in message
news:hkmBd.6387$48.1187@fe1.news.blueyonder.co.uk...
>
> "Old Man" <nomail@nomail.net> wrote in message
> news:ms2dnd8m5M1wcUjcRVn-qg@prairiewave.com...
>>
>> "Androcles" <dummy@dummy.net> wrote in message
>> news:BQ4Bd.182$5R.160@fe3.news.blueyonder.co.uk...
>>>
>>> "Old Man" <nomail@nomail.net> wrote in message
>>> news:yd-dnZtCMa-Y90ncRVn-tw@prairiewave.com...
>>>>
>>>> "Emwizsoon" <emwizsoon@yahoo.com> wrote in message
>>>> news:1104404079.654939.264300@c13g2000cwb.googlegroups.com...
>>>>> Old man and my professor sure know how to torture a mind. I spent
>>>>> the night contemplating how can an electron create a field. Is it
>>>>> in the spinning or vibration, but nothing comes out of the electron
>>>>> as it is a point particle so what cause the field.
>>>>
>>>> An electromagnetic field (E, B) is defined by the force observed
>>>> on a test charge, q with velocity, v:
>>>>
>>>> F = q [ E + v x B ]
>>>>
>>>> It's not clear whether Emwizsoon is referring to the magnetic
>>>> field due to motion of a charge or that due to its magnetic
>>>> moment.
>>>
>>> It's not clear whether Old Fart is referring to vB, v.B or
>>> vx * B, x being distance. Nor has Old Man specified what is meant
>>> by an "electromagnetic" field, since a changing B-field will produce
>>> an E-field and a changing E-field will produce a B-field. Perhaps
>>> Old Fart is talking out his arse.
>>
>> If Androcles knew anything about EM, he would know that
>> "E" and "B" refer to the fields in place, whatever their source.
>>
>> The remainder of Androcles's ignorance based "comments"
>> aren't worthy of comment.
>>
>> [Old Man]
>
> If Old Fart had ever wound an electric motor or generator as
> I did 40 years ago for a living, Old Fart would have learned
> EM from direct experience instead of from second-hand books.
> Those that can, do. Those that can't, teach. Experience is still
> the best teacher.

That's not much of a brag. Old Man can do better:

Old Man is a has been experimental nuclear physicist.
The job was to get a charged nucleus from point A to B,
steering it and accelerating it via electromagnetic fields.
No faking it, the nuceus really had to arrive at point B
with the expected momentum vector. It did. QED

[Old Man]