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Q & A: Superconductor can block magnetic fields, baloney can't

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Most recent answer: 02/22/2011
Q:
http://www.physlink.com/education/askexperts/ae512.cfm
Can lead or anything block magnetic fields? They say that no material can block magnetic fields. They specifically rule out lead.
- Mike W
A:
These guys have never heard of superconductors. Ordinary superconductors expel magnetic fields. Lead foils at low temperature, for example, can be used to shield transformers from magnetic fields. We've done this several times in our lab.
Mike W.

(published on 02/22/2011)

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