Date: Wed, 26 Oct 2011 07:39:16

Author: --- "Cliff Bettis"

Subject: Re: Image Current Demo

Post:

Wolfgang,

What if it's got some monopoles in it? ;-) Seriously, you make a good
point, but with large currents and fields around, it wouldn't take much
asymmetry to see a force.

Cliff

-----Original Message-----
From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
Behalf Of Rueckner, Wolfgang
Sent: Tuesday, October 25, 2011 2:51 PM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Image Current Demo

If it's magnetized, then most likely the orientation of the B field would be
parallel with the rod (poles at ends). Since the current in the wire would
basically be parallel to the B-field, there would be no Lorentz force.

On Oct 25, 2011, at 3:40 PM, Cliff Bettis wrote:

>
> If the iron rod happens to be magnetized, how do separate this from
> the Oersted effect? Did you make sure the iron wasn't magnetized?
>
> Cliff
>
> -----Original Message-----
> From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu]
> On Behalf Of Adam Beehler
> Sent: Tuesday, October 25, 2011 2:24 PM
> Subject: Re: [tap-l] Image Current Demo
>
> I was able to do the demonstration myself. Hooray! But I did it
> differently. I have posted a little video I took of it here:
> http://www.physics.utah.edu/~beehler/tap_l/ImageCurrentDemo.mp4
> I do not yet have the supplies to do it Wolfgang style, so I tried it
> with my "Scientific Supplies, Inc." "Force Between Two Parallel
> Currents Demonstrator."
> http://www.unitedsci.com/detail.php?id=1519
> I removed one of the swinging/pivoting rods and mounted an iron rod
> next to the remaining swinging/pivoting rod. It worked. The swinging
> rod was attracted to the iron rod. I then replaced the iron rod with
> aluminum, copper, and rubber. I was not able to see any repulsion,
> but I did not see attraction either.