The magnetic field direction of the electromagnet can be judged with ampel.

Ampere is the rules of the relationship between the magnetic lines of the magnetic field that stimulates the magnetic field of the current and the current, which is also called the right hand spiral.

(1) The Ampere Ding (Apeging Zezhi 1) in the power -powered straight wire: Hold the power -powered straight wire with the right hand and let the thumb finger in the direction of the current, then the finger of the four fingers is the surrounding direction of the magnetic line.

(2) The Ampel of the Apen in the tube of the power screw line (Ampere Dingzhi 2): Use the right hand to hold the power screw wire tube to make the four -finger bending consistent with the current direction. Then the end of the thumb refers to Nary.

There are many advantages of electromagnets: whether the magnetism of the electromagnet can be controlled by traffic and disconnection; the size of the magnetism can be controlled by the strength of the current or the number of coils. ; Its magnetic poles can be controlled by changing the direction of the current, and so on. That is, the strength of magnetism can be changed, whether it is controlled by magneticism, and the direction of magnetic poles can be changed, and magnetic properties can disappear due to the disappearance of the current.

Electromagnetic is an application of the current magnetic effect (electromagnetic magnetic), which is closely related to life, such as electromagnetic relay, electromagnetic cranes, magnetic suspension trains, electronic door locks, smart channel turns, electromagnetic flow meters, etc.