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Magnetic field blocking

  1. Nov 21, 2004 #1
    Does anyone know of a substance that can block a magnetic field
  2. jcsd
  3. Nov 21, 2004 #2
    Most metals will do that to some extent. There's an alloy called mu-metal that is particularly good at shielding magnetic fields and is used in a lot of medical imaging equipment. It tends to be rather expensive though.
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