Hi all,

A Interesting question (too me), has arisen while briefly
utilizing some neodymium magnet disks.  The normal coil/
magnet scheme for seismometers is to use North-South
poles facing each other; with the coil inbetween.  OK....
what if same poles are repelling (~ North-North); with the
coil inbetween.  Is there really any difference?  Is the normal
attraction of unlike poles really better than the repelling
variety?  I've made a simple jig with same poles facing each
other and I don't really see any difference from my previous
output background in the normal attraction arrangement,
though admittedly I have not yet made different comparison
models of this subject.

A untested thought with this arrangement does occur...and
that is, if the field is repelling, would not the immediate field
around the two magnets be more expanded; would might
benefit the coil induction abit more; especially in the plane
between the magnets outward where the coil is?  This route
"might" benefit coils which are larger in diameter than the
magnet pole faces.

I think the magnetic field around a normal magnet scheme
and a repelling scheme would still be kind of a oval figure 8,
with like a board and iron fileings over the magnets.

Their is of course ways to mount magnet disks in the normal
fashion....but....if the possiblity exists that same poles function
as well; this might make it much easier mechanically to just use
a backing material, glue and brass screw rods between them
for adjustable spacing arrangements.

Another facet is that if they are repelling, the likelyhood of
crashing magnets together and total damage is reduced more.

Any comments or actual experience with same subject out
there?

Thanks,

Meredith Lamb







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