🚀 go-pugleaf

On 4/30/95  Laura Sloma <lsloma@BGNET.BGSU.EDU> wrote:

> I am no expert, but I noticed that the some of the iron pipes under my
> lab tables (gas lines) are magnetic. The students have problems with some
> magnetic field labs bacause of it. At first I thought that it was because
> someone in the past held my very strong magnet up to them. They the
> janitor talked about electric arc welding of the pipes. I suspect this
> may run current through the pipes and permanently aligh the domains.
> This is just my theory. Did you get any other responses? I am curious
> about this also.
>                            Laura

Presence of iron often creates problems with magnetic pipes, even when iron
is not magnetized. I assume you say that pipes are magnetized because they
attract nonmagnetized soft iron (paper clips, nails, etc.) How were the pipes
magnetized? My guess is that it happened when they were manufactured (cooling
in magnetic field). A magnet (pipe in this case) usually has two poles. Try to
locate them. This can eliminate some guesses. I would contact the manufacturer
to clarify the issue.

           Ludwik Kowalski     kowalski@apollo.montclair.edu