What is electromagnetic induction and how is it generated

When the magnetic flux passing through the loop changes, the magnitude of the induced electromotive force in the loop is proportional to the rate of change of the magnetic flux passing through the loop, i.e., induction = t This is Faraday's law of electromagnetic induction. (2) It shows that when the magnetic flux increases, t>0, then the inductance is negative, that is, the magnetic field generated by the induced current is opposite to the direction of the original magnetic field; When the magnetic flux decreases, t <0, then the inductance is positive, that is, the magnetic field generated by the induced current is in the same direction as the original magnetic field. In secondary school, the magnitude and direction of physical quantities are often discussed separately.

As sense=t only reflects its size, its direction is determined by Lenz's law or the right-hand rule. The induced electromotive force is proportional to the rate of change of the magnetic flux, not to the amount of the magnetic flux. For example, if a coil rotates at a constant speed in a uniform magnetic field, when the plane of the coil turns perpendicular to the magnetic field, that is, when the magnetic flux in the coil reaches the maximum, the rate of change is minimal, and the induced electromotive force is zero.

However, when the coil turns parallel to the magnetic field, that is, the magnetic flux through the coil is zero, the rate of change of the magnetic flux reaches the maximum, and the induced electromotive force generated reaches the maximum.

Electromagnetic induction phenomenon The phenomenon of using a magnetic field to generate an electric current is called electromagnetic induction, and the current generated is called induced current. 2 Conditions for generating induced currents When a part of the conductor of a closed circuit moves in a magnetic field to cut magnetic inductance lines, an induced current is generated in the circuit. When the closed circuit of the magnet is relatively stationary, an induced current is generated in the circuit When both the magnet and the closed circuit remain stationary, and the magnetic flux passing through the closed circuit changes, an induced current is generated in the circuit In fact, the above and both cases can be attributed to the change of the magnetic flux passing through the closed circuit, so, no matter what method is used, as long as the magnetic flux passing through the closed circuit changes, there is a current generated in the closed circuit 3 Conservation of energy in the electromagnetic induction phenomenon The electrical energy produced in the phenomenon of electromagnetic induction is not generated out of thin air, they are either other forms of energy converted into electrical energy, or the transfer of electrical energy in different circuits, and the phenomenon of electromagnetic induction follows the law of conservation of energy.

The phenomenon of electromagnetic induction refers to a conductor placed in a changing magnetic flux that generates an electromotive force. This electromotive force is called induced electromotive force or induced electromotive force, and if the conductor is closed into a loop, the electron force drives the flow of electrons, resulting in an induced current.

Electromagnetic induction refers to the phenomenon in which electromagnetic waves induce an electric current or magnetic field around an object. This phenomenon is caused due to the propagation of the energy of electromagnetic waves around the object.

The most basic phenomenon of electromagnetic induction is electrostatic induction. When two objects are placed in an electrostatic field, an induced current is generated. When an object is moved, it generates electromagnetic waves that generate induced currents around it.

Another common phenomenon of electromagnetic induction is magnetic induction. When a magnetic field passes through a conductor, an induced current is generated in the conductor. This phenomenon is used to generate electricity, for example in hydroelectric and wind power stations.

The phenomenon of electromagnetic induction has a wide range of applications in many fields, such as power generation, motors, frequency converters, electromagnetic interference, etc.

Definition of electromagnetic induction phenomenon: the phenomenon that a part of the conductor of a closed circuit moves in a magnetic field to cut magnetic inductance lines, and an electric current is generated in the conductor. This phenomenon of using a magnetic field to generate an electric current is called electromagnetic induction.

Electromagnetic induction phenomenon.

In August 1831, Faraday wound two coils around an iron ring, coil A connected to the DC power supply, and coil B connected to the ammeter. He found that when the circuit of coil A is turned on or off, an instantaneous current is generated in coil B. Faraday discovered that an iron ring was not necessary.

Take away the iron ring and do this experiment again, the above phenomenon still occurs, but the current in coil B is weaker. In order to thoroughly study the phenomenon of electromagnetic induction, Faraday did a number of experiments.

Michael. Faraday.

On November 24, 1831, Faraday submitted a report to the Royal Society, naming this phenomenon "electromagnetic induction phenomenon" and outlining five types of induced currents: changing currents, changing magnetic fields, moving constant currents, moving magnets, and conductors moving in magnetic fields.

Electromagnetic induction phenomenon.

The principle of cutting magnetic inductance lines to generate electric current:

The phenomenon in which a conductor cuts a magnetic inductance line and generates an electric current is called electromagnetic induction.

When a part of the conductor of the closed circuit is cut in the magnetic field, the free electrons in the conductor are still moving irregularly, but at the same time, they all move with the conductor, and the effect is that they move with the conductor, so the free electrons in the conductor are subjected to the same direction of the force of the magnetic field.

Under the action of this force, the free electrons move in the same direction, all from one end of the conductor to the other, so that one end of the conductor has an excess positive charge and one end has an excess negative charge, which also generates a voltage. Because the circuit is closed, the charge is driven by the voltage and moves directionally, forming an electric current.

Cutting Magnetic Inductance Line Applications:

1. Electromagnetic induction.

If a part of the conductor in the closed circuit moves in a magnetic field to cut magnetic inductance lines, the electrons in the conductor will be subjected to the Lorentz force, which is a non-electrostatic force that can cause a potential difference and produce an electric current, which is called induced current.

2. Generator.

The principle of the generator is electromagnetic induction, and the basic structure of the generator is the magnetic field and the coil that rotates in the magnetic field. Its energy conversion is the conversion of mechanical energy into electrical energy.

3. DC generator.

Both the alternator and the DC generator generate alternating current internally, while the outside of the DC generator generates direct current, and the outside of the alternator generates alternating current.

The phenomenon of electromagnetic induction refers to the phenomenon that when the magnetic flux changes, an electric field is generated in it, which creates an electric current in the circuit. This phenomenon was discovered by Faraday in the early 19th century. One of the most well-known applications is generators, which utilize the principle of electromagnetic induction to convert mechanical energy into electrical energy.

In addition, there are many other applications of electromagnetic induction, such as transformers, induction heating, and so on.

The phenomenon of electromagnetic induction plays a crucial role in the development of modern science and technology. For example, its use in wireless communications and radar systems enables people to transmit information between different locations and detect objects over long distances. In addition, electromagnetic induction is also widely used in medical imaging, industrial control, aerospace and other fields.

Correct Answer: Experiments have shown that when the magnetic flux passing through the area enclosed by a closed conductor loop changes, regardless of the cause of the cracking, an induced current is generated in the conductor loop. This phenomenon is called the phenomenon of electromagnetic induction.

Experiments have shown that the phenomenon of electromagnetic induction generates electromotive force. When the circuit is closed, there will be an induction current with a source Zheng. When the loop is not closed, there is no induced current, but the induced electromotive force remains.