Re: Magnets

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz <twftesla-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>

Tesla list wrote:
> 
> Original poster: "jimmy hynes by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<chunkyboy86-at-yahoo-dot-com>
> 
> the magnetic field is created when electrons flow through an conductor,
not by
> only moving a charged conductor. electrons actually move VERY slowly(even
> though signals can travel at the speed of light). if a charged conductor
> created a magnetic field when it was moved then it would have ALOT of extra
> momentum and other weird things that obviously dont happen. im pretty sure
> thats the answer to Antonio's question. i didnt think i would ever be able to
> answer any question that Antonio would have

I'm sorry to say, but your answer is incorrect...
Charges that move don't care if they are inside a conductor or not.
A spark can be deflected by a magnetic field, and generates a magnetic
field around it (otherwise how would it be deflected?). Electrons
moving in vacuum generate magnetic fields around them, and your
monitor's CRT works because of this. Charged objects in movement
do generate magnetic fields. The weird things that you mention happen,
but are almost unobservable in normal conditions. To produce a barely
observable movement in a compass needle, you need to place close to it
a wire transporting a few mA of current. Or, you have to make a few
millicoulombs per second of charge to move close to it. Let's suppose
that a wire with 10 mA of current produces a detectable movement
in a needle placed 1 cm from it (this works. To simplify the 
comparison, imagine that the wire has 1 cm of radius). 
A charged ball with its center at the same distance from the needle
would have at most 1 cm of radius. 
But a ball with 1 cm of radius can store at most 0.033 microcoulombs,
with a surface electric field of 30 kV/cm, the limit for breakdown in 
normal air.
To produce the effect of 10 mC/second, in a brief pulse, it would 
have to move at 10e-3/0.033e-6 = 303 km/s! 
A quite difficult experiment...

Antonio Carlos M. de Queiroz