If a ferromagnetic material is inserted into the coil, what is the effect on the magnetic field of the coil?
Notice the winding of the coil on the hoof iron core. The other side must be clockwise and the other side must be counterclockwise. If the winding is the same, the magnetization of the two coil to the iron core will cancel each other, so that the core will not show magnetism. In addition, the core of the electromagnet with soft manufacture, and not with the steel making. Otherwise, when the steel is magnetized, it will keep magnetism for a long time, but it can not be demagnetization, then its magnetic strength can not be controlled by the size of current, but the advantages of losing electromagnet should be lost.
The iron core after magnetization has also become a magnet, so that the magnetism of the solenoid is greatly enhanced because the two magnetic fields are superposed with each other. In order to make the electromagnet more magnetic, the iron core is usually made into hoofs.
An electric solenoid with an iron core inside is called an electromagnet. When the iron core is inserted inside the through solenoid, the iron core is magnetized by a magnetic field of the through solenoid.
