The magnetic poles at both ends of the U-shaped magnet will not be the same. Because the direction of the magnetic field lines comes out from the N pole and returns to the S pole, that is, the magnetic field lines of the N pole come out and the magnetic field lines of the S pole go in, so the two poles are different. In daily life, the poles of a U-shaped magnet are N pole and S pole.

U-shaped magnet was originally used as a substitute for bar magnet, and this shape has become a universal symbol of magnet. According to the strength of horseshoe magnet, it can be used to pick up metal objects of any size.

The principle of u-shaped magnet.

U-shaped magnets can attract iron, cobalt, nickel and other substances because the magnetic field generated by current will magnetize other objects, and the magnetized objects will generate electric fields, and the interaction between electric fields will generate force. The internal structure of magnet atoms is special. It has a magnetic moment and can generate a magnetic field, so it can attract iron, cobalt, nickel and other substances.