Date: Thu, 25 Sep 2003 16:02:47 -0600

Author: Jerry DiMarco

Subject: Re: Awesome EM induction demo!


I think it would be easier and wiser to protect the magnet,
especially if it's used for other demos. I put heat shrink tubing over mine...


At 03:30 PM 9/25/2003, you wrote:
>Thanks for pointing that out Zig. I had noticed a couple of nicks in
>the Cu already...
>So, let me extend my question: could I coat the Cu with anything to
>provide it better protection?
>Cheers - Matt
> >>> 9/25/2003 3:15:40 PM >>>
>Matt, the copper is very softer and dings up, not the magnet. Zig


Jerry DiMarco
Manager of Lecture Demonstrations and Instructional Labs
Montana State Univ., Physics Dept.
Bozeman, MT

Our Motto: "There's a demo in there somewhere."
From Thu Sep 25 15:28:56 2003
From: "Dick Heckathorn"
Subject: RE: Awesome EM induction demo!
Date: Thu, 25 Sep 2003 18:13:46 -0400
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What about the plastic "paint" used to coat tools, etc?

"Science is nothing more than learning how to communicate with nature in
such a manner that it will talk back."

Helping teachers who facilitate, motivating students who learn.
Dick Heckathorn 14665 Pawnee Trail Middleburg Hts, OH 44130
Physics Teacher CVCA 4687 Wyoga Rd Cuyahoga Falls, OH 44224
330-929-0575 VM 120

-----Original Message-----
[] On Behalf Of Matt Lowry
Sent: Thursday, September 25, 2003 4:09 PM
Subject: Awesome EM induction demo!

Howdy tappers,

I just got my hands on the materials for the amazing demo that Zig and
the PIRA Gang displayed at the AAPT meeting in Madison... the alloy 101
O2-free copper plate with neodynium magnet. It's a freakshow! My
department is going nuts over this demo.

For those who don't know, what you do is take the magnet in your hand,
pass it over the plate, and you can really feel the magnetic braking
forces as a result of the EM-induction in the copper. There are all
kinds of tricks to do with this one, but the best are with LN2 cooling
down the copper! I strongly encourage you to check this one out.

Anyway, on to my question: I'm concerned that dropping the magnet onto
the plate could chip it since neodynium magnets are somewhat ceramic in
nature. Is there anything someone would suggest that I coat the magnet
with in order to protect it?


Matt Lowry
Lake Forest HS
Lake Forest, IL

From Thu Sep 25 16:00:56 2003