[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Magnetic Polarity Re: Magnetic quenching.
Original poster: Ed Phillips <evp-at-pacbell-dot-net>
Tesla list wrote:
> Original poster: "Daniel Ullfig" <DUllfig-at-sbcglobal-dot-net>
> > The definition of North Magnetic Pole is That Which Points Geographic
> > North. Period.
> > THIS means that the Earth's Geographic North Pole is associated with
> > a SOUTH magnetic polarity there (actually: Northern Canada, or the
> > nearby ice pack... 8)>>)
> > yes: it is counterintuitive and mind bending. Also true..
> > Had it cross checked by a physicist once. For experimental
> > verification:
> > Wind a solenoid, observing 'left hand' rule for winding direction,
> > connect DC PSU in Specified Polarity and check compass...
> The concept of north and south poles is completely arbitrary; Physicists
> could have started by saying "the earth is a giant magnet, and the north
> pole coincides with the magnetic north pole". then we would have decided
> that the south pole of a magnet is that which points to the north; finaly,
> when we discovered that electricity produces a magnetic field, we would have
> discovered the "right hand rule" instead of the "left hand rule", and it
> would all have worked out anyways. In physics, some rules are just
> arbitrary, and everyone agrees to them.
It was common in the older books to refer to the "north-seeking pole"
of a compass needle, which is not ambiguous. Of course, this is the
south pole of the needle. I wonder if the original designation of north
came about because most navigation was done in the northern hemisphere
where Polaris was commonly observed to indicate north?