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Ken Fox asks:
I know that a Faraday cage will shield electric fields. Can one ( and how)
sheild against magnetic fields? I can't remember (and I don't easily find a
reference in my resources here) and was put on the spot today with that
question.
Magnetic fields are shielded by Type-I superconductors. Just coat the
surface that bounds the region from which you do not want a magnetic
field with a Type-I superconductor whose thickness is significantly thicker
than both the superconductor's penetration depth and its coherence length.
David Bowman
dbowman@gtc.georgetown.ky.us