Re: Particle Visualization



Monitek wrote:
> "PD" <TheDraperFamily@xxxxxxxxx> wrote in message
> news:1117754586.654490.24160@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> >
> snip
> >
> > That is flat wrong. A changing magnetic field in the evacuated (or
> > air-filled) gap of a dipole magnet will produce a measurable electric
> > field in that gap, which can be tested by the placement of a
> > *stationary* electron or other charged, nonconductive object in that
> > gap.
> >
>
> There is something a bit iffy about the above. First of all an electon can
> be moved by a magnetic field

A *stationary* electron is moved by a magnetic field? Are you sure?

> which does not indicate any electric field
> being present. Personally I would have put a capacitor in the gap if I
> wanted to measure electric field strength.

Yes, that would work too, with a voltmeter strapped across it.

> Secondly how do you get your
> magnetic dipole magnet to change its magnetic field?
>

Lots of ways, any of which would work
1. Change the current in the electromagnet
2. Increase or decrease the space between the pole tips
3. Move the magnet to one side, so that the electron now is sitting in
a region of weaker field
4. Insert a piece of iron in half the gap (where the electron isn't),
creating a magnetic parallel circuit with a shunt in one leg
5. Heat the magnet if it's a permanent magnet
I'd like to see how you can assert these are all examples of induction.

But don't take my word for it. Do the experiment yourself, as Faraday
would.
I've seen the effect myself, in the form of a corona discharge in the
gap of a superconducting dipole that's just quenched. Quite
frightening. And quite convincing.

PD

.

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