--- On Wed, 1/5/11, Macy Larry <lmacy@mac.com> wrote:
> Electricity does move air, so why not magnets??
'cause the air does not (hopefully) contain iron, the key ingredient to
magnetism. The sound is likely the magnets resonating, or more simply the coils
vibrating as they are pulsed.
As for non-ferrous metals becoming magnetic, ANY metal exposed to a field as
great as 7 Tesla will have an induced surface charge.
Ron
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