MadSci Network: Physics
Query:

Re: Is there any existing substance that can nulify a magnetic field?

Date: Thu Jul 2 02:36:31 1998
Posted By: Emmanuel Durand, M.D., nuclear medicine, faculte de medecine de BICETRE
Area of science: Physics
ID: 895174589.Ph
Message:

No, but ...

No you can not nullify a magnetic field
(if any device generates a magnetic field you can not make it 
just disappear)

However, you can either

* shield this magnetic field
some materials (like steel) may bend a magnetic field, changing its shape 
thus making it considerably weaker in some places. However, it will not 
annihilate the field especially in in the very place where it is being 
created

* counter this magnetic field
that is you can make another field which has a similar shape but an 
opposite sign so that in some places, the sum of both fields will be nearly 
 null.
The latter is sometimes called active shielding


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