Electromagnet principle
When the iron core is inserted inside the power thread tube, the iron core is magnetized by the magnetic field of the power pipe tube. The magnetic core after magnetization has also become a magnet, so that the two magnetic fields are superimposed, which greatly enhances the magneticity of the thread tube. In order to make the electromagnet magnetic more magnetic, the iron core is usually made into a hoof shape. However, pay attention to the opposite of the coil on the hoof -shaped core, on one side, and the other side must be clockwise. If the two coils are performed to the iron core, the magnetization of the two coils will offset each other, causing the iron core to be not magnetic. In addition, the core of the electromagnetic iron is made of soft iron, and it cannot be made of steel. Otherwise, once the steel is magnetized, it will maintain magneticity for a long time and not be magnetic, then the strength of its magnetism cannot be controlled with the size of the current, and the a
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