Date: Thu, 07 Nov 2002 15:04:02 -0500

Author: Sam Sampere

Subject: Re: mod on eddy current

Post:

You can get the spherical magnets at www.wondermagnet.com. Bill Beatty
turned us on to this outfit. So far, I'm very pleased with their service and
product.

Sam

Ed Dudak wrote:

> Sounds like something I'd like to use. Where did you get the
> magnets? Thanks. -Ed Dudak
>
> >Cool, Sam! I tried this on a length of aluminum angle bracket we had
> >lying around, and it was spectacular.
> >
> >____________________________________________________
> >Jason St. John 617.353.2634 stjohn@bu.edu
> >Boston University Physics Lecture Demonstrations
> >
> >On 2002-11-07.10:35 owner-tap-l@listproc.appstate.edu sent:
> >
> >I bought some of those cool NdFeB magnetic spheres for various demos.
> >Here's a way cooler way to show the Eddy current tube.
> >
> >First, roll the ball down a long piece of flat plastic. It's not very
> >spectacular, you get just what you expect. Then roll it down a long
> >piece of copper. I'm using a piece of 1/8" x 8" x 36" OFHC. The ball
> >very slowly rolls down the new incline. Repeat this several times until
> >the copper is vertical. It's just too cool!
> >
> >The sheet is much cheaper than the thick walled tube, and much lighter
> >too.
> >
> >Sam
>
> --
> Ed Dudak
> Dudak@grinnell.edu
> Physics Department Technical Assistant
> Grinnell College
> Grinnell, Iowa
> 641-269-3022

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