Re: is the magnetic field really moving?

In article <Ydqkk.150504$gc5.99977@[EMAIL PROTECTED]
>,
 "Don Kelly" <dhky@[EMAIL PROTECTED]
> wrote:

> > Dip a bar magnet into iron filings to map the lines of force. Rotate
the
> > magnet and you can see the "lines" rotating with the magnet. This
> > experiment must have been performed countless times.
> >
> > On the other hand, perform an experiment with a rotating nozzle on the
> > end of a hose. Does the column of water leaving the nozzle rotate with
> > the nozzle?
> >
> > Bill
> -------------
> But as the filings form lines of little magnets which are "attached" to
each 
> other and to the magnet- and are stable in position with respect to the 
> magnet- likely as determined by minor variations in the surface - why
should 
> they not move with the magnet. Now a thin film of lubricant on the
magnet 
> might show something different :)
> 
> -- 
> 
> Don Kelly dhky@[EMAIL PROTECTED]
> remove the X to answer

I just thought of another experiment or two. Make a solenoid wound on 
cardboard tube many (10) times longer than its diameter. Tuck a battery 
inside the tube to drive the solenoid. Cap the tube ends with 
nonmagnetic thrust bearings. Sprinkle the iron filings on the caps to 
map the lines of force.

Rotate the caps while keeping the tube stationary. The "lines" rotate. 
Now keep the caps from rotating and rotate the main solenoid. Now, the 
"lines" do not rotate with the solenoid.

Draw your own conclusions.

Bill