Date: Thu, 25 Sep 2003 15:08:55 -0500

Author: "Matt Lowry"

Subject: Awesome EM induction demo!

Post:

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?

Cheers,

Matt Lowry
Lake Forest HS
Lake Forest, IL
From peacock@physics.utah.edu Thu Sep 25 13:28:38 2003
Message-ID: <3F734CEC.1FD2FD16@physics.utah.edu>
Date: Thu, 25 Sep 2003 14:15:40 -0600
From: "Zigmund J. Peacock"
Organization: University of Utah , Department of Physics
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Subject: Re: Awesome EM induction demo!
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Matt, the copper is very softer and dings up, not the magnet. Zig

Matt Lowry wrote:

> 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?
>
> Cheers,
>
> Matt Lowry
> Lake Forest HS
> Lake Forest, IL

--
Zigmund J. Peacock WWW.physics.utah.edu/people/staff/peacock.html

University of Utah/Physics peacock@physics.utah.edu
115 SOUTH 1400 EAST #201 Tel 801 581 6602
SALT LAKE CITY UT 84112-0830 Fax 801 581 4801

"We sleep safely in our beds because rough men stand ready in
the night to do violence to those who would do us harm"
-- George Orwell

"All that is necessary for the triumph of evil is that good
men do nothing!"
-- Edmund Burke

From MLowry@D115.ORG Thu Sep 25 13:44:52 2003

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