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camair
camair asks:
Q:

does magnetism travel through all materials?

In Topics: Science fair, Helping my child with science
> 60 days ago

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Expert

greenprof2
Dec 9, 2010
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What the Expert Says:

Magnetism is an interesting and still mysterious property of some materials, mostly metals like iron and nickel. Magnetic materials create a field around themselves that can penetrate most materials, like wood for example. Thus you can use a magnet to move a piece of iron around a tabletop even though the magnet is under the wood. Magnetic fields can be shielded however by placing a steel or iron box over the magnet, which blocks the field. There are also materials specially manufactured for this purpose (see web link).

Michael Bentley, EdD, Expert Panelist
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Additional Answers (1)

bob
bob , Parent writes:
Good answer from greenprof.  If you want to read up on one particularly interesting application of blocking magnetic and other emissions, web search the term "tempest room."  I got to watch them process of building of those when I worked at a NASA center quite some time ago.  A very impressive example of making a whole room where NOTHING (including magnetic fields) could get out.
> 60 days ago

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