The video is to show you how to find the polarity of your magnets using a compass.
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 a way we can use.
The earth can be pictured as a gigantic magnet, but the geographic North Pole actually is the South Pole of a neodymium bar magnet. For this reason, the North Pole of the magnet will point to the South Pole of a compass.
For more information, please visit https://www.stanfordmagnets.com/