The magnetic north pole, meanwhile, is the point in the Northern Hemisphere where Earth's magnetic field lines point directly ... of a regular bar magnet, the magnetic south pole — the point ...

If all the compasses in the world started pointing south rather than north ... Such reversals in the Earth's magnetic field, they'd tell you, are, roughly speaking, as common as ice ages.

Bar magnets and horseshoe magnets are two of the most common shapes of magnet. The magnetic field is shown by lines with arrows that point from ... bring a north pole and a south pole together ...