The magnetic field formed around the magnet is closed, that is, there is no magnetic monopole (charges can be compared, the electric field line is not closed, and there are separate positive and negative charges, but the magnetic field lines are closed, and there are no separate N and S poles), while the direction of the magnetic induction line is that the N pole points to the S pole outside the magnet, and the S pole points to the N pole inside the magnet, and the magnetic induction line formed around the magnet is closed, so when the magnet is disconnected, The magnet will be divided into N pole and S pole on the broken surface according to the direction of the original magnetic induction line, and follow the principle that the direction of the magnetic induction line is that the N pole points to the S pole outside the magnet and the S pole points to the N pole inside the magnet, so that the S pole will be formed at the cross section of the N pole with the original N pole at one end and the original S pole at the other end, so that repulsion will be generated at the broken surface according to the principle of "opposites repel each other".

Okay, powder