The magnetic induction lines come out of the North Pole and enter the South Pole, forming a closed curve from the South Pole to the North Pole inside the magnet; the two magnetic induction lines never intersect. The earth itself is a huge magnet. Because the geographic poles do not coincide with the geomagnetic poles, the north-south direction indicated by the magnetic needle is not the north-south direction of geography, but slightly deviated.
Every magnet has the North Pole and the South Pole, and its two poles always exist in pairs. When we make strong magnets for customers, these permanent magnets have no pole mark if there is no special requirement. But if you want to ask how to determine the polarity of magnets, here are some ways we can use. 1. A marked magnet: the North Pole of one magnet will be attracted to the South Pole of another magnet.
2. Magnetic pole identifier: With a small painted neodymium bar magnet suspended in the middle of round plastic housing, this pole identifier not only indicates the polarity, but also shows the direction of magnetic field lines in a certain extent. While revolving around a magnet, the middle small magnet in the identifier will rotate all the time.
3. A compass: the earth can be pictured as a gigantic magnet, but the geographic North Pole actually is the South Pole of a neodymium magnet. For this reason, the North Pole of the magnet will point to the South Pole of the compass.
4. Electronic pole identifier: quickly, easily and accurately
Simply point the tip of electronic pole identifier pen at any place of a magnet, press the button and the LED will light to show the polarity.