The teacher said that the magnetic field is a substance. Right? I m skeptical. 40

The essence of magnetic field and electric field is the same, they are a special substance that exists between the electric charge and the moving charge, we can't see it, we can't touch it, but they exist objectively, they are the medium that transmits the electric field force between two non-mutual contact charges, the magnetic field force between two electric currents, they store electric and magnetic fields, so they both have energy.

The material form of nature can be divided into two types: physical objects can be seen and touched, and fields cannot be seen or touched, and the types of fields are gravitational field, electric field and magnetic field. The geomagnetic field is a typical magnetic field, which is generated by the earth, and if there is no geomagnetic field, the compass cannot mark the geographical direction, so the magnetic field is actually there.

Yes, but this substance can only be perceived through some phenomena.

It's substance. It is a substance that cannot be seen or felt by humans.

The existence of human beings cannot be denied just because they cannot be perceived, just like a person who has never seen an apple, does the apple not exist.

There are many more such substances.

Such as radio waves, all kinds of invisible light, infrared, ultraviolet rays, etc.

Some animals can perceive it.

Yes, a field is a substance.

Including electric fields, magnetic fields.

There's a lot to learn at university.

The same substance is manifested in two most basic phenomenal forms, one is the physical and particle forms; One is the form of field and wave. The magnetic field belongs to the field matter, so of course it is a substance.

Substance? Matter is defined as the physical objects and fields that make up all objects in the universe.

All matter must exist objectively; The second is that it is bound to interact with other substances, and absolutely isolated matter does not exist, or we cannot perceive the existence of such "matter".

Since the interaction between many substances must be achieved through the "field", there is the theory of "field matter", and this field also exists objectively. Ordinary matter and magnetic matter are the same in the object, but magnetic matter can produce a substance called a "magnetic field" around it, but there is no material around non-magnetic objects. So there is a "field", so there is a force to interact, and without a "field", of course there can be no interaction.

It is this objective distinction between "being" and "non-existence", between acting and not working.

We can tell if there is a field between two objects.

From the perspective of "whether there is an action and whether such an action objectively exists", we can distinguish and understand "field matter", and we will often not misunderstand its category.

At the same time, there is a difference between the "field matter" and the physical matter we come into contact with, and the most typical difference that makes it easy to misunderstand whether it exists is that it is invisible.

Both magnetic field and electromagnetism are special substances. The "field" is characterized by having energy as well as momentum. Of course, it is different from the physical matter I usually see.

They can also excite each other in a vacuum, as only the magnetic field changes with time that excites the electric field. According to what you said, from the perspective that the electric field and the magnetic field can excite each other, the inhomogeneous magnetic field may not produce an electric field, and our symmetrical understanding may be different, for example, the electric field inside the constant current is a constant electric field, that is, the electric field strength does not change with time, and is similar to the electrostatic field in nature. Secondly, an electric field can produce a magnetic field.

The fifth question, I feel that your understanding is a bit confusing, first of all, I think there is something inappropriate, it is not necessary to understand the three questions of 2, 3, and 4 that do not need to exist in the actual conductor, and in the first question, are you satisfied? Actually, when you were discussing the relationship between electric and magnetic fields, you thought that when a conductor moves in a magnetic field, it can generate an electric current and form an electromagnetic wave.

I don't know the answer, the mutual excitation of the electric field and the magnetic field forms electromagnetic waves, and the magnetic field can also produce an electric field, we can say that the electric field and the magnetic field have symmetry, but the electric field and the magnetic field still have different properties and laws. Talk about symmetry in these aspects.