Hi,
I ran it 'red' for several minutes. I have since bought a 'cheap'
ceramic magnet that just barely holds on and it works but I still don't
understand why it shouldn't work for the Nd magnet. My only idea is that
the magnet kept the wire cooler than the Curie temp. (i.e.: heat doesn't
travel through Nd as fast as ceramic???). I even tried moving the Nd
magnet to the still glowing 'red' spot and it held. I drained two 6V
batteries 'playing with this. I guess I'll be satisfied with the ceramic
magnet demo. Would be interested in any ideas though - very puzzling.
Thanks!
Jon
BTW: I tried 'D' cells and nothing happened and then tried a 12V battery
and the wire melted (I had both 'D' cells and a 12V battery hanging
around) - you might want to put a warning or advice to use only 'new' 6V
batteries (doesn't work with used 6V batteries either).
-----Original Message-----
From: On-line Snack discussion [mailto:snaktalk@exploratorium.edu]
Sent: Thursday, February 26, 2004 11:58 AM
To: Frederick Wallace
Cc: snacktalk@exploratorium.edu
Subject: re: curie point demo.
Dear Frederick,
In the "To do and Notice" part of the Snack, it reads:
If the wire does not heat up enough to glow red, move the clip leads
closer together.
Did you try this?
Deb
________________________
Deb Hunt
Snacktalk Moderator
Exploratorium
3601 Lyon Street
San Francisco, CA 94123-1099
dhunt@exploratorium.edu
On Thu, 19 Feb 2004, Frederick Wallace wrote:
> Hi,
> I found this on your site and tried building it. I placed a small Nd
> magnet on a string and I ran it for 15 minutes and although it got
hot,
> the magnet never let go. Do I have to use a ceramic magnet or a
special
> magnet? I thought the Curie point made the wire non-magnetic so any
> magnet would work. I tried placing the magnet on the 'red hot' section
> and it still attracted. Any help is appreciated. Thanks!
>
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