Can anyone tell me why the motion of electrons produces magnetism? Please

On the first floor, A is the only premise for proving B's existence, and B is the only premise for proving A's existence. A is Maxwell's theory of electromagnetic fields, and B is Faraday's theory of electromagnetic induction. When you ask him why magnetic fields produce electric fields, he will tell you with b.

You find that theories that presuppose each other cannot be used as proof of "existence". It can only be used as proof of "necessity" and "uniqueness".

Q: Why do you look back when you see beautiful cuties on the street? Why are you an individual? The problem cannot be proven.

In fact, the magnetic effect of electricity is strictly deduced from experiments. It can't be mathematically proven to you why 1+1=2Because other mathematical methods are based on 1+1=2, we cannot use the products derived from the source to prove that the source still has a source.

Isn't the source 1+1=2 provable? The answer is simple, there is no need to prove some accepted truth, the universal phenomenon of experiments.

Oster wound an energized wire around an otherwise non-magnetic iron rod and found that: Wow, the iron rod has the ability to attract other substances such as iron, cobalt and nickel, and this ability is known as the magnetic effect (as is the name on Earth). Without electricity, the magnetism disappears.

Excuse me: What does this mean? It's like you see a pretty mm on the road, and your neurotransmitters send electrical signals to neurons, and you say:

This mm is quite attractive, isn't it also a "magnetic" effect?

There is an electric field around the charge, and the distribution of the electric field around the charge is that the electric field is stronger the closer to the charge, the electrons move directionally, and the electric field around the electrons also moves, according to Maxwell's theory of electromagnetic fields, the changing electric field produces a magnetic field.

Classmate, let me give you a detailed deduction.

1. Electrons move directionally to generate electric current.

2. There is a magnetic field around the current (this is electromagnetism, which can be learned in high school) discovered by West.

If you want to ask why there is a magnetic field around an electric current, then Maxwell's theory of electromagnetism, which you learned in high 3, shows that a changing electric field produces a magnetic field, and the two are alternately perpendicular.

I wonder if there is a connection between the two because the movement of electrons can also produce electromagnetic waves.

The motion of charged particles in a magnetic field is a uniform circular motion. The gyratory motion of charged particles refers to the uniform circular motion of charged particles around the magnetic field lines in a constant magnetic field. A particle with an electric quantity of q, a mass of m, and a velocity friend base of v is subject to the Lorentz force when moving in a uniform and constant magnetic field b.

Characteristics of the movement of charged particles

The frequency at which the particle rotates around the magnetic field lines. This is called the gyration frequency or Lamor frequency. The direction of the gyratory motion is related to the positive and negative signs of the charge carried by the particle.

For a definite particle, the stronger the magnetic field, the higher the cyclotron frequency; The greater the mass, the smaller the gyro frequency. The trajectory of the gyratory motion is a circle, which is called the Lamor circle.

The charged particles in the magnetic field move in a circular motion around the magnetic field lines, and they form small rings of electric current, and the direction of rotation of the positive and negative charges is opposite, but the direction of the current formed is the same. The total effect of the whirling motion of a large number of charged particles around the magnetic field lines is the formation of a hoop current.

This current can produce an induced magnetic field, the direction of which is exactly opposite to the original magnetic field b, and it plays the role of counteracting or resisting the original magnetic field, this property is called diamagnetism, so the plasma can be regarded as a magnetic medium.

The essence of magnetic phenomena is an electrical phenomenon, and the field is a change in space, that is, there is an electric potential difference in space, so that energy can be transmitted from high to low, thus emitting magnetic force.

Electric field: generated by a stationary charge;

Magnetic field: Generated by a moving charge...

Electric field characteristics: to any charge, whether in motion or not, by force.

Magnetic field characteristics: It only has a force on the moving charge (including electric current, magnetic poles).

Electric field strength: The direction of force on the positive charge is the direction of the field strength of the pointMagnetic field strength: The direction of the magnetic needle n pole is the direction of the magnetic induction intensity of the change point: the electric field line: The tangent direction of any point above it is the direction of the field strength of the point.

Inductance lines: The direction of the field strength is a closed curve.

Where there is an electric field, there must be a magnetic field, and where there is a magnetic field, there must be an electric field, and the two are interdependent and inseparable.

It is not the electrons that have a magnetic field, but the movement of a large number of electrons that creates a magnetic field. I didn't understand the concept.

The motion of charged particles in a magnetic field is a gyratory motion.

The cyclotron gyration of a charged particle in a magnetic field refers to the uniform circular motion of charged particles around the magnetic field lines in a constant magnetic field.

A particle with a quantity of q, a mass of m, and a velocity v is subjected to the Lorentz force f=qv b when moving in a uniform and constant magnetic field b, and the direction of the force f is perpendicular to the direction of velocity v and magnetic field b, and the value is qv b, and v is the component of velocity v perpendicular to the direction of the magnetic field. This force can only change the direction of the velocity, not the value of the velocity. Also known as gyro or lamor motion.

Principle

The frequency at which the particle rotates around the magnetic field lines. This is called the gyration frequency or Lamor frequency. The direction of the gyratory motion is related to the positive and negative signs of the charge carried by the particle.

For a definite particle, the stronger the magnetic field, the higher the cyclotron frequency; The greater the mass, the smaller the maneuver frequency. The trajectory of the gyratory motion is a circle, which is called the Lamor circle.

As can be seen from the formula, if two particles with the same charge but different masses have the same velocity and the same magnetic field, the Lamor radius is proportional to the mass of the particle. This principle is often used to make mass spectrometry instruments. For charged particles with a certain velocity, the stronger the magnetic field, the smaller the Lamor radius.

Therefore, with a strong enough magnetic field, it is possible to confine charged particles around the magnetic field lines.

Electric field force f = e*q (e is the electric field strength, q is the charge of the particle).

Lorentz force f = b*q*v (b is the intensity of magnetic induction, q is the amount of charged particle destruction, and v is the velocity perpendicular to the magnetic field).

The force experienced by the charged particle in the electric field is in the direction (or opposite direction) of the electric field, the positive particle is in the direction of the electric field, and the negative particle is in the opposite direction of the electric field.

The charged particle is subjected to the Lorentz force in the magnetic field, and its direction is determined by the left-handed rule (this should be the case).To make it clear to you, if you stretch out your left hand and make the magnetic inductance line pass through the palm of your hand, so that the direction of the four fingers follows the direction of motion of the positive particle (if it is a negative particle, then make the direction of the four fingers follow the opposite direction of the motion of the negative particle), then the direction of the thumb is the direction of the Lorentz force.

To judge the motion of a particle, it is necessary to look at the direction of the particle's velocity and force.

For in an electric field: (if the charged particle is only subjected to the electric field force) because in a fixed electric field, the direction of the electric field force experienced by the charged particle will not change, then, you can analyze the electric field force similarly as gravity, if the initial velocity of the charged particle is parallel to the direction of the electric field force, then the particle does (uniform acceleration or uniform deceleration) linear motion, if the initial velocity of the charged particle is perpendicular to the direction of the electric field force, then the particle does a flat throwing motion.

Yes in a magnetic field: (if the charged particle is only subjected to the Lorentz force) Since the Lorentz force is always perpendicular to the direction of the velocity of the charged particle's motion, the Lorentz force does not change the magnitude of the velocity in the direction of changing velocity, but if the direction of velocity changes, then the direction of the Lorentz force will also change. If the velocity of the charged particle is perpendicular to the magnetic field, then the charged particle will move in a uniform circle in a plane perpendicular to the magnetic field (the trajectory of motion may be an arc), and as for which side (left or right) the initial velocity of the particle is going, it depends on which side the Lorentz force is going.

If the charged particle is subjected to more than one force, then the resultant force is analyzed.

Generally, the motion of charged particles in a uniform magnetic field is a uniform circular motion.

For example, a small ball with a mass m and a charge of q (q greater than zero) falls from rest at a height of h above the ground. In order for the ball to never collide with the ground, it is envisaged that a sufficiently strong horizontal uniform magnetic field is added when it begins to fall.

Try to find the minimum value b of the magnetic induction intensity of the magnetic field, and find the trajectory of the ball when the magnetic field takes b.

Answer: Give the ball a horizontal initial velocity v, so that the Lorentz force and gravity on the ball in the punch section are equal, so the interference of gravity is excluded. But this velocity is added by ourselves, so we need to add a reverse velocity to the ball to balance this velocity, and the reverse velocity is to make the ball move in a uniform circular motion.

The radius is H2Using this, the velocity v and the magnetic field strength b can be solved.

As for the trajectory of motion, it is a superposition of a uniform circular motion and a uniform linear motion.