What material(s) can shield an object from a magnetic feld?

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Peter

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Peter asked the Naked Scientists:
   
What material(s) can shield an object from a magnetic feld?

What do you think?
« Last Edit: 06/02/2011 17:30:04 by _system »

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Offline yor_on

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What material(s) can shield an object from a magnetic feld?
« Reply #1 on: 06/02/2011 18:01:20 »
No, you can't 'shield' but you can retrace it around/from a object by offering it a 'easier path'. The reason you can't shield it is that there are no magnetic 'charges' as there is with electricity (positive and negative charges). Magnetic field lines will pass through all materials I know off. But you can reroute it.

Look at what "conduct" magnetic flux best, then use that.
« Last Edit: 06/02/2011 18:09:22 by yor_on »
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Offline Bored chemist

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What material(s) can shield an object from a magnetic feld?
« Reply #2 on: 06/02/2011 18:27:47 »
Passive shielding as described above works very well. It works even better if you use a superconductor as a shield.
There is another trick called active shielding where you measure the field and set up an opposing field with an electromagnet.
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Offline graham.d

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What material(s) can shield an object from a magnetic feld?
« Reply #3 on: 06/02/2011 18:52:16 »
A material that is used to shield magnetic flux is called mu-metal. It does not work 100% though.