What Ron said.... Fast phase changes in Magnetic fields will cause
electromagnets to resonate. Electron Magnetometers occasionally give off a
buzzing/humming sound when the fields swap polarity. Something above 1 Tesla
would make even more sound but the air is stirred by the magnets (or coils?)
themselves, not by the field.
FWIW, the MRI I get locally is an "open" unit. I lay still on the table
while the business part of the unit rotates slowly around me. The images are
very clear but I do not know how many Tesla this machine uses. I do know it
takes up most of a small building!
Cheers!!
Jim
On Wed, Jan 5, 2011 at 11:47 AM, Ron Soave <soavero@yahoo.com> wrote:
> --- 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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--
Cheers!!
Jim
Then there was the mind reader who moved to Washington, D.C. and couldn't
find work.
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