Magnetic pole

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Indication of the compass needle near the poles of the magnet

Magnetic pole - a term used in two ways: Magnetic pole in physics

The most commonly used definition is: A magnetic pole is a place of a magnetic needle, a permanent magnet, or an electromagnet in which the intensity of the magnetic field has the greatest value.

The magnetic needle has two poles. Placed in a fixed magnetic field, it aligns with the direction of the field line. In the magnetic field of the Earth this is approximately (on most of the Earth's surface) the direction in the direction of the meridians. Consequently, the ends of the needle are called north (N) and southern (S) - north is the end pointing to the geographic north, the south ending pointing to the south. These names are clearly stretched for all magnets, defining their poles as north and south respectively.

Similarly to the law of electrostatic law, it is possible to formulate Coulomb's law for magnetostatics, describing the interaction of two poles, but there is a significant difference between the two. All known sources of magnetic field have a pair of magnetic poles - north and south (magnetic dipole). It is not possible to physically separate them; Cutting a two-pole magnet creates two new magnets, each with two poles.

A magnetic monopole (single pole N or S) appears as a particle in some physical theories, but it has never been observed. Magnetic pole in geography

As with electrical charges, single-pole magnetic poles repel and unlike electromagnetic ones. The paradoxical conclusion is that, since the needle is set to its north pole north, the southern pole of the Earth's geography is located in the south pole of the "Earth Magnet" (and vice versa, near the South Pole). p>

In order to avoid misunderstandings and mixed concepts, geologic and geo-geophysics do not define the poles of the Earth's magnetic field with physical names but only geographical ones. So the magnetic pole of the northern hemisphere is called north, and the magnetic pole of the southern hemisphere, although physically "should be called the opposite."

wiki

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