What is the magnetism of the broken surface after the magnet is broken?

Magnets are often broken in daily production, life and teaching. When a bar magnet is broken, it becomes two bar magnets. When a ring magnet (such as the magnet used in toy racing motor) is broken, it becomes two semi-circular magnets. When a cake magnet is broken, it becomes two semi-circular magnets (such as the magnet used in loudspeaker).
So, what is the magnetism of the fracture surface after these magnets are broken?
On the issue of the magnetism after the fracture of the magnet, there are often debates on the Internet. Some say that the magnetism at the fracture surface is opposite, while others say that the magnetism at the fracture surface is the same. However, it is difficult to find the relevant discussion in various materials. What on earth? With this problem, I found a variety of magnets to do experiments. The results show that the magnetic properties of the broken surface of the bar magnet are opposite (that is, there are different magnetic poles), and the two broken surfaces attract each other and are easy to connect; After the ring magnet and cake magnet break, the fracture surface is mutually exclusive, so it is difficult to press them together. Even if they are forced together, as long as the hand is released, they will push each other away immediately, and one of them will immediately reverse. The fracture surface seems to be the magnetic pole with the same name. It is easy to understand the synonym of the broken surface of a bar (or hoof shaped) magnet. This is because a magnet can be regarded as a regular arrangement of multiple small needles (that is, the adjacent small needles are connected by mutual attraction of different magnetic poles. According to Ampere’s theory of the origin of magnetism – molecular current hypothesis), breaking a magnet is equivalent to separating the small needles at a certain place. After separation, two small needles are separated In other words, the magnetic properties of the other two ends remain unchanged.

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