Maybe we all knows that magnet has two pole - N and S. However how to identify the poles of the magnets? Someone may not know it. So today, I'd like to introduce 4 methods to identify the
Disc neodymium magnets:
1, It can be used the geographic pole to determine, such as bar magnet, first, use a thread tied up the magnet middle and hanging up, after the magnet close to static, the side which pointing to the north, it's the N pole, other side is S pole.
2, Using a magnet which known its poles and close to the unknow magnet. The opposites will stick together, and if they are same pole , it will reprehend each other.
3, Find a compass and keep it steady , use a magnet close to the N pole of the compass, if repulsion, it's N pole, or it's S pole.
4,Testing by instruments, such as gauss meter.