Re: pinhole electromagnetism

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From: Paul Doherty (pauld@exploratorium.edu)
Date: Wed Oct 22 2003 - 10:21:29 PDT 

Message-Id: <l031107bbbbbc6c900b7b@[192.168.112.78]>
Date: Wed, 22 Oct 2003 10:21:29 -0700
From: Paul Doherty <pauld@exploratorium.edu>
Subject: Re: pinhole electromagnetism

Hi karen

The wire will not attract the iron filings. The magnetic field is too weak.

The wire should go through the center of a piece of cardboard,
perpendicular to the cardboard.

Sprinkle the iron filings on the cardboard.

Connect the power.

gently vibrate the cardboard.

the filings make circles around the wire.

Paul D

See the Snak Circle of magnetism.

http://www.exploratorium.edu/snacks/circles_magnetism_I.html

>In trying to show magnetism in an electric circuit, I'm not succeeding,
>except with the compass which isn't enough of a show for elementary.
>
>What am I doing wrong in these 2 demos?
>
>1. bare copper wire connected to D cell. Book says it'll align iron filings
>sprinkled on paper above the connected circuit. But no magnetic fields
>show in my substitute steel wool "dust," those tiny pieces that fall out.
>Individual staples work no better. 2 D cells in series: no change.
>
>2. Any magnetism at all? If I try to see if the wire attracts any of this
>stuff -- nothing, no attraction there at all.
>
>Is this substitute for iron filings too heavy? Any suggestions to really
>show magnetism in a circuit?
>
>Thanks, Karen W.
>
>
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