Date: Thu, 21 Jun 2001 07:38:50 -0700
Author: Roger Key
Subject: Re: unknown demo
This caught my attention because I have one too ...... Ours is a
magnet with a conductive "sheath" cover that runs on HO scale
Looks to me like it's not in the bibliography .... but could be thought
running 1K10.10 backwards .... sound about right? I couldn't find
it as described.
At 08:40 AM 6/21/01 -0500, you wrote:
The force on the bar is F=ilXB,
where i=current in the bar, l=length of
bar, B=magnetic field of other bar. B supplied by other bar
B=mu*i/2*pi*r, where i= current in stationary bar, and r is the
between the bars at the instant in question. Clearly, since r
this becomes an integral from r1 to r2, if you want to get the total
moving the bar while the current is connected.
Symmetry allows you to exchange which bar is which, but you've got
fixed, and the other moveable, so that is the usual explanation.
of course, I'm still asleep...Karl
>Could someone please enlighten me as to the name and details of a
>that I have?
>A current is supposed to pass through parallel rods, upon which are
>movable (rolling) bar. The movable bar is sitting in a
>field. When a small voltage is applied, a current flows, and
>toward the supply.
>I understand the "basic" concept of interacting fields
between the parallel
>conductors and conductors trying to force themselves apart because of
>interaction. But, why does the interaction of the magnetic
>to roll in one direction? Is this demonstrating Lenz's
>Thanks for any replies, I hope the question is not to dense!
>Faculty of Health & Sciences
>3649000 extn 8330