Re: Magnetic Polarity Re: Magnetic quenching.

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Robin Copini" <rcopini-at-merlin-dot-net.au> 

More off topic - it gets worse as far as this flip over is concerned, recent
studies have shown that the core of the planet is approximately 40% into its
next cycle and will be completed in approx 5000 - 10, 000 years. Considering
I live in Adelaide on the bottom of Australia, I wouldn't mind the 'north'
pole being on my side of the planet for a while, considering North is
equated with 'up' :-)

Best Regards


  Robin


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, April 30, 2004 12:27 AM
Subject: Re: Magnetic Polarity Re: Magnetic quenching.


 > Original poster: "teri mckenney" <mck-at-ezy-dot-net>
 >
 > Hello All,
 > This is getting off topic but what I find interesting is that scientist
have
 > discovered by studying old lava flows that the polarity of the earth flip
 > flops every so often.Something going on in the core of the earth? This
would
 > support an earlier post that said north and south were arbitrary.There are
 > two polarity's which trade places every so often thus keeping each other
 > even.
 > Bill Mck.
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Wednesday, April 28, 2004 2:08 PM
 > Subject: Re: Magnetic Polarity Re: Magnetic quenching.
 >
 >
 >  > Original poster: davep-at-quik-dot-com
 >  >
 >  >  > 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.
 >  >      Agreed.
 >  >
 >  >  >  Of course, this is the south pole of the needle.
 >  >      Is it?
 >  >      Have you tested?
 >  >      My understanding and testing and reading indicate that the
 >  >      'n' end of a compass needle is defined as the North Seeking
 >  >      End, shortened to 'noth pole' which makes geographic
 >  >      NORTH a Magnetic SOUTH pole.  Counterintuitive.
 >  >
 >  >  >  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?
 >  >      Likely.  At least nitially.  At least for Europeans.
 >  >
 >  >
 >
 >