Re: is the magnetic field really moving?

On Tue, 26 Aug 2008 21:24:47 -0700 Salmon Egg <SalmonEgg@[EMAIL PROTECTED]
>
wrote:
| In article <g8vv5j32pgd@[EMAIL PROTECTED]
>, phil-news-nospam@[EMAIL PROTECTED]
 
| wrote:
| 
|> 
|> I believe his [salmone] question is equivalent to the question of
whether a conductor
|> that is in motion through space can tell whether the magnetic field
that is
|> crossing it perpendicular to its motion is there as a result of a very
long
|> magnet (imagine billions and billions of bar magnets attached side by
side)
|> that it is moving beside, or the result of a single magnet that is
moving
|> with the conductor.  In both of these cases, the field intensity would
be
|> the same for the conductor over the time of its movement.  If this
conductor
|> is perpendicular to both the vector of movement and the orientation of
the
|> field, will a charge be induced in both cases?
| 
| My question rephrased is simple:
| 
| At non-relativistic speeds, what experiment, gedanken or real, can tell 
| whether a symmetrically fabricated cylindrical bar magnet in a 
| laboratory is spinning about its axis or not?

A conductor segment, placed at one end of the bar magnet, positioned so
that
one end of the conductor is near the extended axis of the magnet, and one
end of the conductor is near the extended outer edge of the magnet. 
Measure
the charge induced into this conductor by means that does not involve
adding
more conductors.  One way to do this is by means of a pair of thin foils
at
and end of the conductor to see how much static charge is present.

Another position this conductor can be placed is anywhere along the
outside
of the magnet, oriented so the conductor has one end near the magnet and
one
end away from the magnet.

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