Why N and S poles cannot be separated?2018-06-21
Even if the grain magnet breaks open, the N pole and the S pole will not separate, but the power will be reduced, and the N and S poles will always be connected. Go and find hidden secrets in the N and S poles together!
N and S poles
The magnets will attract each other and they will also repel each other. This is because there are attractive "gravitational forces" between the magnetic poles of different names, and mutually repulsive "repulsive forces" exist between the magnetic poles of the same name.
Prepare a bar magnet. Use red to indicate the N pole. Use blue to indicate the S pole. If you divide the bar magnet into two pieces, one can easily think that the N and S poles will be separated, but this is not the case. Because every atom that forms a magnet has N and S poles. The N and S poles already exist in the magnet atom, so even if the magnet is divided even further, the two poles of the magnet will not separate. For a long time, scientists have been looking for magnets that have only one pole, namely "magnetic unipolar". However, so far, people have not found a magnet with only one pole.
Permanent magnets and electromagnets
A permanent magnet is an object that can maintain its own magnetic properties without applying an external magnetic field. Electromagnets, on the other hand, are electromagnets that have magnetism when current passes through them. If the current is cut off, the magnetism disappears. The wire is wound into a coil. Like a magnet, it has N and S poles. This is a simple electromagnet. Electromagnets, like permanent magnets, have two poles that attract iron, but unlike permanent magnets, the poles and magnetic sizes of electromagnets can change. Electromagnets are used in electromagnetic cranes that lift more than one ton of weight.
Solenoids and superconducting magnets
The solenoid is the simplest type of electromagnet. It is made by winding wires densely around a cylindrical core. If a current passes through the solenoid, a magnetic field is generated. If a core is added inside, a stronger magnetic field can be obtained. Manufacture of solenoids is very simple and inexpensive and can be applied in many fields. However, electromagnets also have disadvantages. Even if the current is constantly increased, the resulting magnetic field is limited. However, the superconducting magnets make up for this disadvantage because even if current passes, no heat is generated, and if a more powerful current is continuously provided, a stronger magnetic field can be obtained.