Fields of application of magnetic fields

Magnetic phenomenon is one of the earliest physical phenomena recognized by human beings, and the compass is a great invention in ancient China. Magnetic fields are widespread. Earth, stars (such as the sun), galaxies (such as the Milky Way), planets, satellites, as well as interstellar space and intergalactic space, all have magnetic fields. In order to understand and explain many of these physical phenomena and processes, the magnetic field must be considered as an important factor. In modern science and technology and human life, magnetic fields can be encountered everywhere. Generators, motors, transformers, telegraphs, telephones, radios, accelerators, thermonuclear fusion devices, and electromagnetic measuring instruments are all related to magnetic phenomena. Even in the human body, along with life activities, weak magnetic fields are generated in some tissues and organs. Earth's magnetic level is opposite to the geographic poles.

In ancient and modern societies, many inventions that have made significant contributions to world civilization involve the concept of magnetic fields. The earth is able to generate its own magnetic field, which is very important in navigation because the north pole of a compass points exactly to the magnetic south pole, which is located near the earth's geographic north pole (the geographic north pole is actually the magnetic south pole, and the geographic south pole is actually the magnetic north pole). The operation of both electric motors and generators relies on magnetic fields that change over time as the magnets turn. Through the Hall effect, the properties of charged particles of matter can be given. Magnetic Circuits deals with the interaction of the internal magnetic fields of various electronic components such as transformers.