Date: Thu, 26 Aug 2010 09:33:21

Author: Jerry DiMarco

Subject: Re: De-magnetizing


Back when I was learning about magnets I read a passage in a book
about demagnetizing large objects. The details are sketchy but in general
it does take high current, and it may also take several passes through the
coil, or several cycles if you use the method described by Andy. The
problem (if I recall correctly) is that the demagnetizing field does not
penetrate thicker metals...


At 8/25/2010 04:28 PM, you wrote:
>One of my prof's just came down saying he needed to de-magnetize a 4 inch
>diameter piece of metal. Will just putting that into a 6 inch dia X 1
>foot long solenoid and applying AC work or do I need to go to more
>extraordinary lengths.
>Dale Stille
>U of Iowa


Jerry DiMarco
Manager of Lecture Demonstrations and Instructional Labs
Montana State Univ., Physics Dept.
Bozeman, MT

Our Motto: "Find your inner demo."

From Thu Aug 26 11:51:57 2010