Magnetic force of electromagnet

The magnetic force of an electromagnet is electromagnetism, which means that if a straight metal wire passes an electric current, a circular magnetic field will be generated in the space around the wire. The greater the current flowing through the wire, the stronger the magnetic field produced. The magnetic field forms a circle around the wire.

The characteristics of the magnetic force of the electromagnet:

1. The magnetic force of the electromagnet can be changed.

2. The magnetic force of the electromagnet is related to the number of turns of the coil: the smaller the number of turns, the smaller the magnetic force, and the more the number of turns, the greater the magnetic force.

An example of an application of electromagnetism is the electromagnet that is commonly used in laboratories. In order to carry out certain scientific experiments, strong constant magnetic fields are often used, but ordinary solenoids are not enough. To this end, in addition to winding as many coils as possible, two opposing solenoids are placed close together so that their N and S poles are opposite, so that a strong magnetic field is generated between the two coils. In addition, pure iron (called a yoke) is also placed in the middle of the wire package to gather the magnetic field lines and enhance the magnetic field in the middle of the wire package,

For a very long solenoid, the internal magnetic field is calculated by the following formula: H=nI

In this formula, I is the current flowing through the solenoid and n is the number of solenoid turns per unit length.