Mysterious Questions About Magnets 10

This result is really amazing, and there is also a suspicion that the small screws are not magnetic! I imagined it like this!

First of all, the magnet is divided into north and south poles, the two poles are the most magnetic, and the middle is the weakest! Second, magnets can magnetize iron, cobalt, nickel,

Your little screw must have been magnetized and placed in the middle of the big magnet, so that the magnet is very small and has a strong magnetization ability, so when you use the screw to get closer, it is the small screw that is magnetic and flies to the screw, because the screw has no magnetic force, it is the mutual attraction between him and the screw that beats the attraction of the nut and the magnet! (Mainly because the magnet force is weak in the middle, or even absent, and the thing that is easy to magnetize the iron, makes him magnetic).

Do you think so?

The key is the contrast of the strength of the magnetic field! Obviously, the magnetic field strength of the magnetized small screw is greater than the magnetic field strength of the large magnet where the small screw is placed! Note that the magnetic field strength is not the same everywhere on the large magnet, only at the poles is the strongest, and in the middle of the poles, the magnetic field strength is reduced to almost 0!

The closer you get to the poles, the stronger, and the closer you get to the middle, the weaker!

You don't know what you're described, but it's very likely that the magnetic poles of the nut are affected, causing the nut to repel the big magnet!

Matter is mostly made up of molecules, which are made up of atoms, which in turn are made up of 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. If the electrons in ferromagnetic substances can be arranged to form a magnetization region with the same direction, the magnetism can be enhanced.

Electromagnets also use this principle to temporarily change the electronic structure to produce magnetism. Therefore, if the electronic structure of the magnet is changed under the influence of external forces, the magnetic force will also disappear.

will disappear, and when you put the magnet on a fire to burn, the magnetism of the magnet will slowly weaken and gradually disappear.

Categories: Education, Science, >> Science & Technology.

Problem description: A pie-shaped magnet, if it is disconnected in the middle, we calculate according to the theory, one end is the n pole, and the opposite pole is the S pole after disconnection, in the same way, one end is the S pole, and the opposite pole is the n pole after disconnection, then they should attract each other. But we've done experiments and found that they're mutually exclusive. This is not in line with the theory.

Please explain: The poles of a pie-shaped magnet are not at the ends but on the sides.

For example, the top is the n pole and the bottom is the s pole.

After the middle is disconnected, the upper part of the section is still the n pole, and the bottom is still the S pole.

If you connect it according to the section, it becomes the upper part connected to the upper part, the lower part is connected to the lower part, and it becomes n to n, and S to S, isn't it the same name?

Every moment of our lives is about magnetism. Without it, we can't watch TV, listen to the radio, and play **; Without it, even the night would be pitch dark.

Although human beings have recognized magnetic phenomena for a long time, it is not until modern times that people's understanding of magnetic phenomena has gradually been systematized, and countless electromagnetic instruments have been invented, such as **, radios, generators, motors, etc. Nowadays, magnetic technology has penetrated into all aspects of our daily life and industrial and agricultural technology, and we have become more and more inseparable from the wide application of magnetic materials.

Since the magnetism of matter can neither be seen nor touched, we cannot directly experience the existence of magnetism through our five senses (hearing, sight, taste, smell, and touch), but people have gradually unveiled its mystery in practice. A magnet always has two poles, one is the n pole and the other is the S pole. A magnet, if sawn from the middle, becomes two magnets, each with a pair of poles.

No matter how small the magnet is, it will always have n and s poles, which means that the n poles and the s poles will always appear in pairs, and it is impossible to make a magnet have only n poles or only s poles.

There is an interaction between the magnetic poles, i.e., the same sex repels each other, and the opposite sex attracts. In other words, when the n pole and the S pole are close together, the retardant fluid attracts each other, while the N pole and the n pole are close to each other. Knowing this, we can see why the compass automatically indicates the direction.

It turns out that the earth is a huge magnet, and its n pole is near the south pole of geography, and the s pole is near the north pole of geography. In this way, if a long magnet is suspended from the middle with a thin wire and let it rotate freely, then the n pole of the magnet will attract each other to the s pole of the earth, and the s pole of the magnet and the n pole of the earth will attract each other, so that the magnet will rotate in the direction until the n pole and the s pole of the magnet point to the s pole and n pole of the earth respectively. At this time, the direction indicated by the n-pole of the magnet is near the north pole of the geography.

Magnets can attract iron, cobalt, nickel, and can also point to the direction of the indication. When it is stationary, one end points to the north and the other head to guide, but the direction of the finger is not due south, but has a certain declination, which is called magnetic declination.

The reason why magnets can attract iron, cobalt, and nickel is that these substances are magnetized in the magnetic field to form small magnetic needles, and then attract each other.

Magnets lose their magnetism when exposed to heat. Magnetism and electrons are inseparable, there is magnetism around the moving electrons, this is called the electromagnetic effect, after the magnet is red, the molecules inside it are so hot that they run around, destroying the directionality of the electron movement, the electromagnetic effect cancels each other, and the whole "magnet" no longer shows magnetism.

Experiments have shown that after the magnet burns red, it loses its magnetic properties. Because when the temperature of magnets and magnets increases, the molecular thermal movement inside them becomes faster and faster. When the temperature rises to a certain value, the violent molecular thermal motion finally completely destroys the regularity of the direction of the electron motion, and the magnetism of the magnet disappears.

Metallurgists refer to the temperature at which magnets and magnets completely lose their magnetism"Curie temperature"。The Curie temperature of steel is 770.

If you look at how magnetism is generated, you will naturally know why it is lost, and the principle of magnetism is explained as follows: there are many tiny current rings inside the general object (such as the circular motion of electrons to form a current loop), and these current loops will produce corresponding magnetic effects, because the direction of the magnetic field generated by the internal current loop of the general object is chaotic, and the magnetic field strength in all directions cancels each other, so the object is macroscopically non-magnetic; From this, it can be thought that the magnetism of magnets is due to the fact that some of the tiny circuits inside the object are arranged in a certain way for some reason (such as placing a non-magnetic iron block in a constant magnetic field for a long time), and the total magnetic field strength in one direction is greater than that in the other directions, so it exhibits magnetism. High temperature will intensify the movement of molecules inside the magnet, disrupt the internal molecular arrangement, and make the magnet lose its magnetism, which was discovered by Marie Curie, so the high temperature demagnetization point of the magnet is called the Curie temperature of the magnet.

For example, high temperature or vibration causes the magnetic pole molecules to lose their original regular arrangement, thus losing their magnetism.