Xref: utzoo sci.physics:18099 sci.bio:4780
Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!mit-eddie!media-lab!minsky
From: minsky@media-lab.MEDIA.MIT.EDU (Marvin Minsky)
Newsgroups: sci.physics,sci.bio
Subject: Re: Magnetic Levitation of Organic Materials
Message-ID: <5659@media-lab.MEDIA.MIT.EDU>
Date: 15 Apr 91 20:16:55 GMT
References: <1489@gtx.com> <40065@fmsrl7.UUCP> <1689@sheol.UUCP>
Reply-To: minsky@media-lab.media.mit.edu (Marvin Minsky)
Organization: MIT Media Lab, Cambridge MA
Lines: 15

In article <1689@sheol.UUCP> throopw@sheol.UUCP (Wayne Throop) writes:
>MRI (the euphemism for what used to be called NMR imaging) involves
>subjecting a person to magnetic fields of between 1 and 2 trillion (as
>in 10^12) gauss.
>
>If I'm mistaken about the field strength involved in MRI, I'd appreciate
>being corrected.

The fields are only a few thousands of Gauss.  There is an MRI machine
a few blocks from here that uses a large permanent magnet.  Astounding
well designed pole pieces, I would say -- considering that my pocket
compass is not disturbed when forty feet away from the monster.

   The huge number might have come from someone converting Tesla to
Gauss a couple of extra times.