Re: is the magnetic field really moving?

On Fri, 1 Aug 2008 05:09:21 -0700 (PDT) Benj <bjacoby@[EMAIL PROTECTED]
> wrote:

| On Jul 31, 7:23?pm, 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.

If I place a round magnet near a round piece of iron, where each are on
separate axles aligned in the same axis and free to rotate, would rotating
the magnet cause the iron to rotate?

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