Re: is the magnetic field really moving?

On Jul 31, 7:23=A0pm, Salmon Egg <Salmon...@[EMAIL PROTECTED]
> wrote:

> 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.

OK. My conclusion is that iron filings don't "map" lines of force at
all. "Lines of Force" are a rather bogus concept to begin with and
iron filings only make patterns that LOOK like "lines of force", but
certainly don't somehow measure or represent them.  The only "true
test" of your experiment would be to somehow measure qVxB emfs at the
end caps. And note that you must do that WITHOUT using current loops.
If you use loops then you get the same result no matter if you assume
the fields move with the magnets or if you assume they don't. What
changes is the ****tion of the sensing loop where the voltage is
induced.