Date: Thu, 07 Nov 2002 15:04:02 -0500
Author: Sam Sampere
Subject: Re: mod on eddy current
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
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 email@example.com
> >Boston University Physics Lecture Demonstrations
> >On 2002-11-07.10:35 firstname.lastname@example.org 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
> Ed Dudak
> Physics Department Technical Assistant
> Grinnell College
> Grinnell, Iowa