MadSci Network: Physics

Re: Substance blocks magnetism but also reacts to it

Date: Wed Dec 5 18:26:24 2001
Posted By: Dr. Fred Jeffers, Staff, Magnetic Recording Research, Iomega corp.
Area of science: Physics
ID: 1006807862.Ph

     The only material that actually blocks a DC magnetic field is a 
superconductor.  That requires extreme cold and very special materials.
     The other way to "block" magnetic fields is to cancel them out by 
moving an easily magnetized body like a sheet of iron close to the point 
you want to shield.  The best way to do it is to put a soft iron box 
around what you want to shield.  That is not a perfect shield but will 
reduce the field perhaps a factor of 100 or more depending on the details.
     There is no way that I know of to shield a magnetic field with a body 
that does not react to the field.        

Current Queue | Current Queue for Physics | Physics archives

Try the links in the MadSci Library for more information on Physics.

MadSci Home | Information | Search | Random Knowledge Generator | MadSci Archives | Mad Library | MAD Labs | MAD FAQs | Ask a ? | Join Us! | Help Support MadSci

MadSci Network,
© 1995-2001. All rights reserved.