Why are magnets strongest in the middle of two levels?

Because the magnet is magnetic because there is the action of electrons, the distribution of electrons is from west to east, the front end of the key head is +, the back end is -, the magnetism on both sides of the magnet is large because the + and - at both ends can not be canceled, so the magnetism is large, and the + and - in the middle cancel each other, so the more you go to the middle, the weaker the magnetism.

If the magnet is only magnetized in the ordinary magnetization way, the outermost magnetic force of the bar magnet is the strongest, and the magnetic force at the middle junction of the two poles is the weakest. The middle of the magnet belongs to the junction, which is not that there is no magnetic field, but because the magnetic field at the place is inside the magnet, the force on the external ferromagnetic material cannot be expressed, and it is manifested as a magnetic pole dividing line at the junction, and the external space adjacent to the middle of the magnet belongs to the no (weak) magnetic zone.

Hehe, here's a place where you misunderstood. Let me explain below:

First, let's analyze the magnetic induction strength of the next bar magnet. This is the same as you analyzed in the supplementary question, the strength of the magnetic induction is mainly determined by the density of the magnetic inductance lines. Therefore, the magnetic induction intensity outside the magnet is strong at both ends and weak in the middle; Inside the magnet, it's the same everywhere.

It's easy to prove this conclusion if you have a magnetic induction strength gauge if you make a wire into a spiral coil and energize it (which is the equivalent of a bar magnet). You can measure that the magnetic induction intensity inside the coil is the same everywhere, strong at both ends on the outside and weak in the middle. Of course, if you don't have a measuring device, you can also use a small compass, spring dynamometer, and thin wire to form a less accurate measuring device (and then look at the definition of magnetic induction, and you will know how to use this homemade measuring device).

In daily life, I often say that "the poles of the magnet are the strongest and the middle is the weakest", mainly because what we can "touch" is the outside of the magnet. In this regard, the Chinese language will give priority to the phenomenon.

Added to the question:

The outer poles of the magnet are strongest because the magnetic inductance lines are most dense there. That's right, the number of magnetic lines that pass through the two levels also passes through the middle. So for a magnet, the magnetic induction intensity inside the magnet is the largest (which is what you call the middle, because the internal magnetic induction intensity is evenly distributed), followed by the two ends of the outside of the magnet, and then the middle of the outside of the magnet.

As I said last time, in daily life, I often say that "the poles of the magnet are the strongest and the middle is the weakest", mainly because what we can "touch" is the outside of the magnet. In this regard, the Chinese language will give priority to the phenomenon.

Judging by your terminology, I feel like you're thinking about magnetic flux (just speculation). If there is a coil that is not very large around the middle of the magnet, then the magnetic flux of the coil is the largest, that is, the magnetic flux through the cross-section of the magnet (note that it is the cross-section) is the largest, but if the coil placed in the middle is large, its magnetic flux becomes the smallest again (because when the magnetic flux is found, the magnetic inductance lines passing through the coil will cancel each other out when they are in opposite directions, that is, the outer magnetic inductance lines and the internal magnetic inductance lines cancel each other out). However, the magnetic flux is not considered when only finding the magnetic induction intensity.

The number of magnetic lines that pass through the two levels also passes through the middle, and the middle should also be the strongest, which is right.

It's just that what people usually say is that the two levels are the strongest, and the middle is the weakest, which means that the outside of the magnet, the place near the poles is stronger, and the place near the middle is the weakest. Because the magnetic inductance lines are emitted from the n pole of the magnet and return to the S pole of the magnet through the external space, near the n pole, the magnetic inductance lines are in the form of emission and aggregation near the S pole, that is to say, all the magnetic inductance lines pass through the vicinity of the two poles, and in the middle, the magnetic inductance lines can be distributed to a wide area, and the number of magnetic inductance lines passing through the unit area is very small.

None of the above three people are the root cause.

There is a concept called magnetic molecule, the current movement formed by the rotation of electrons of each atom around the nucleus will form a magnetic field, then the inside of each magnet can be seen as a large number of small magnets of molecular size, each magnet is only magnetic on both sides, and the small magnets are arranged together, and the ones next to each other are canceled out. Near the two sides, that is, the poles, the arrangement of small magnets (magnetic molecules) is not as uniform as in the middle, so the magnetism cannot be canceled out, and thus the magnetism is stronger.

The magnetic inductance line is a closed curve that passes through the magnet, and the magnetic field line is the thinnest in the middle of the outer part of the magnet, so the magnetic force is the weakest.

There is an analogy that you hold an infinite number of large and small rings in your hand, and the middle finger of your hand (equivalent to the middle part of the magnet) is the most thinly distributed ring.

In the middle is exactly where the n-level and the s-level are superimposed, the so-called -1 + 1 ) = 0, so the magnetic field is the weakest.

Upstairs is right, but it's not the reason, why are the magnetic inductance lines distributed like that?

Magnets are magnetic because the molecular currents are oriented in the same direction, and if they are facing the two poles, the magnetic field at the two poles is relatively strong.

The magnetic field, on the other hand, has a magnetic field sideways, but it is relatively weak.

Experimentally measured. All of the above explanations are hypothetical for the time being.

Science is supposed to use experiments to get a phenomenon first, and then put forward a hypothesis, and if the hypothesis can basically conform to the facts, it is said to be a theorem.

Science is an approximation.

The density of magnetic field lines varies.

In the middle is the offset of the positive and negative poles.

The poles of the magnet are s and n.

The composition of the magnet is iron, cobalt, nickel and other atoms, and the internal structure of the atoms is relatively special, and it itself has a magnetic moment. Magnets are capable of generating magnetic fields and have the property of attracting ferromagnetic materials such as iron, nickel, cobalt, and other metals.

The midpoint of the bar magnet is hung with a thin wire, and when it is stationary, its two ends point to the south and north of the earth, the one end pointing north is called the north pole or n pole, and the one end pointing south is the guide pole or s pole.

Applications of magnets

Magnetic materials have been widely used in various aspects of traditional industries. For example, without magnetic materials, electrification would not be possible because generators are used to generate electricity, transformers are used to transmit electricity, electric motors are used in electrical machinery, and loudspeakers are used in electric machines, radios, and televisions. Many instruments and meters use magnetic coil structure.

Magnetic materials are also widely used in the military field. For example, ordinary mines or mines can only be used when they are in contact with a target**, so they are of limited use. And if a magnetic sensor is installed on a mine or mine, because the tank or mine is made of steel, when they are close (without touching the target), the sensor can detect the change in the magnetic field to make the mine or mine **, which increases the lethality.

What the above 3 people said is not coincidental, and the tomb is the fundamental reason for the change.

There is a concept called magnetic molecule, the current movement formed by the rotation of electrons of each atom around the nucleus will form a magnetic field, then the inside of each magnet can be seen as a large number of small magnets of molecular size, each magnet is only magnetic on both sides, and the small magnets are arranged together, and the ones next to each other are canceled out. Near the two sides, that is, the two poles, the arrangement of small magnets (magnetic molecules) is not as uniform as in the middle, so the magnetism cannot be offset by filial piety, thus showing a strong magnetism.

It is determined by the characteristics of the magnet.

If it is explained by atomic current, it means that the magnetic field generated by the closed current magnetizes other objects.

Magnetized objects produce an electric field.

The electric field interacts with each other to produce the action of force.

Matter is mostly made up of molecules, which are made up of atoms, which in turn are made up of atomic nuclei and electrons. Inside the atom, the electrons rotate incessantly and revolve around the nucleus. Both of these motions of electrons produce magnetism.

But in most matter, the direction of electron movement is varied and chaotic, and magnetic effects cancel each other out. Therefore, most substances are not magnetic under normal conditions.

Ferromagnetic substances such as iron, cobalt, nickel or ferrite are different, and the electron spins inside them can be spontaneously arranged in a small range to form a spontaneous magnetization region, which is called a magnetic domain. After the ferromagnetic material is magnetized, the internal magnetic domains are arranged neatly and in the same direction, so that the magnetism is strengthened, and the magnet is formed. The magnet magnetizes the magnet, and the magnetized iron and the magnet have different polarities of attraction, and the iron is firmly "glued" to the magnet.

Let's say that magnets are magnetic.

It's not for this reason, it's because the poles are the most magnetic, which is the same as why magnets are magnetic, they are all truths, there is nothing to explain, the magnetic inductance lines are drawn by people according to the nature of the magnet, not after people draw it, the nature of the magnet is determined!