Why does a round tube electromagnet lose magnetism when it is cut off?

Why does a round tube electromagnet have no magnetism when it is cut off? Do you know why? Let's let the little editor tell you.

The internal solenoid with iron core is called an electromagnet. When an iron core is inserted inside the electrified solenoid, the iron core is magnetized by the magnetic field of the electrified solenoid.

After the magnetization, the core also becomes a magnet, so that the magnetism of the solenoid is greatly enhanced due to the superposition of the two magnetic fields.
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In order to make the electromagnet more magnetic, the iron core is usually made into a hoofed shape. But we should pay attention to the opposite direction of the coil on the hoof core, while clockwise, the other side must be counterclockwise.

If the winding is the same, the magnetization of the two coils will cancel each other, so that the cores are not magnetized. In addition, the core of the electromagnet is made of soft iron instead of steel.

Otherwise, once the steel is magnetized, it will remain magnetic for a long time instead of degaussing, and the strength of its magnetic strength can not be controlled by the size of the current, and the advantages of the electromagnet should be lost.

So the above is the reason that the tube electromagnet loses its magnetism when it is out of power, so the knowledge of more tube electromagnets will wait for the next time to share with you.