Lenz's Law of Electromagnetic Induction

Lenz's Law of Electromagnetic Induction .

When we talk about magnetic induction, we mean creating an electric current in a particular electrical circuit from a change in the flow of the outer magnetic field. The flow of the magnetic field is calculated according to the following rule: φ = B.dS and here we note that the change of flow φ depends on two variables, the first is the area S through which the magnetic field lines enter and secondly the intensity of the B magnetic field, in our case we will take a fixed space and limit to changing the magnetic field magnet J to change the flow across that fixed space, and this is where the relationship between the magnetic field and the flow becomes a direct relationship and the S space becomes only a constant. The area here through which the lines enter the field is a copper metal wire wrapped in the shape of a circle we call a "coil." The flow relationship becomes as the area becomes fixed as follows: φ = B.S.

When we talk about creating an electric current, we mean to make the free electrons on which the outer layers of the metal wire atoms are available move rapidly within the metal wire on the one hand ... On the other hand, any electric current can also create another magnetic field! In this case, we will have an external magnetic field b created by a magnet and then another induced magnetic field B (ind) will be created by the induced electric current in the circuit or metal lap. It means the variable external magnetic field will create an electric current in the metal lap and the electric current created in the metal lap will also create another magnetic field called the induced magnetic field. I hope you understand very well what I am talking about and if you have difficulty understanding, read the previous paragraph more than once until you understand what I mean and then go to the next paragraph!

The electrons that are in the metal wire are not interested in any change in the lines of the magnetic field across the area that the wire is determined by, i.e. do not want to increase its value or decrease and any attempt to increase or decrease the value of the field across the space, the electrons will begin to move to resist this change because considered a nuisance to her. Here the lap (spire) is static and we will work to round the magnet towards it quickly as shown in the picture.

When we try to round the magnet from the metal lap, the intensity of the external magnetic field B increases in value within the lap area as we get closer and closer, which will make the electrons of the metal wire (lap) move in a certain direction so that it tries to neglect the increased intensity of the outer magnetic field across the The area bordered by the metal wire, and the movement of these electrons inside the wire is the same electrical current induced by the intensity of the variable magnetic field inside the lap! And so an electrical current was created within the metal wire through a variable B external magnetic field, but as we said, the direction in which this current will rotate is not random, but it will rotate so that it creates another magnetic field called an induced magnetic field B (ind) and the orbit of this induced magnetic field is to neglect the value of Increased external magnetic field across lap space. So the Induced Magnetic Field B (ind) that will be disturbed by the moving electric current inside the metal wire will be opposite to the external magnetic field B. As well as the same thing occurs if the magnet moves away from the metal lap, the intensity of the external magnetic field B begins to decrease across the lap area forcing the electrons to try to kill this decrease in the intensity of the external magnetic field, so that they begin to move in a certain direction so that they create an induced magnetic field B (ind) works to compensate for the lack of external magnetic field severity, so the electric current is also created but this time the induced magnetic field will be oriented in the same direction as the outer magnetic field.

So can we say that electrons are aware of what they are doing and can sense the existence of a changing magnetic field in some way! Are electrons attacking the variable magnetic field across the area bordered by the metal wire to kill it? It is not so that electrons respond to the changing external magnetic field only because they are charged and because they are present in the outer layers of atoms they are almost free and have no strong association with the cells of atoms.

So electron sensors for the changing magnetic field are the electrical charges they carry. This magnetic induction method is the same way that the electric current we use in our daily lives is generated in power plants where magnetic induction is used to generate electricity.