North Pole and BioMagnetic North Pole

Which pole is the biomagnetic north pole?

This is not so easy as you might think.

The best way to think of it is 'like poles repel each other' and 'opposites attract'

So if your magnet was floating or hanging on a string, the end that faces the earths south pole is the biomagnetic north.

That sounds easy enough! Until you come to another very common convention that has the north and south poles the other way round! If you own a compass, the end that points to the earths North Pole is considered to be the north pole of the compass.

The biomagnetic north pole is the end of the magnet that attracts the arrow of the compass needle.