First, I think it's important we at least
understand a little bit about what
"magnetism" is, and how ferrofluids
interact. A ferrofluid is a suspension of
really tiny magnetic particles. You can think
of them as tiny bar magnets floating around.
They're so tiny that under normal conditions (if
there's no magnetic field), heat causes them to
point in random directions. However, when you
apply a magnetic field, it causes all the bar
magnets to line up along the magnetic field lines
of the applied magnetic field. As far as the
"level of magnetism" in the ferrofluid,
these magnetic particles will respond to any
applied magnetic field, and when the field is
removed, the particle orientation will be
It's actually really difficult to shield things
from magnetic fields, but one type of metal you
could use to disrupt the magnetic field is
mu-metal, which is specially designed for
this purpose. You could also interfere by creating
an even stronger magnetic field, which interferes
with the original field.
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