I think you are asking which materials a
magnetic field can penetrate. If this is your
question, then the answer is almost all of
them. The exception is superconductor
materials, which can block weak magnetic fields.
This is called the Meissner Effect. If the
magnetic field is strong enough, however, it can
break the ability of the superconductor to
superconduct. This is why I say that they can
block only relatively weak magnetic fields.
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