Is a magnetic field matter or energy, and does it have mass?

The magnetic field is matter and energy, it has a moving mass, and the rest mass is zero.

The magnetic field is invisible or touchable, but it exists. It should be a substance. It is a substance that has mass, so there is also mass.

The force field that occurs around a permanent magnet or electric current, that is, the space that can be reached by the magnetic force, or the range of the magnetic force, is called the magnetic field; Therefore, strictly speaking, there is no certain limit to the magnetic field, only strong and weak. Like any force field, a magnetic field is a form of energy that transfers the action of one object to another.

It's energy, it's massless matter.

The magnetic field is artificially prescribed, it is an imaginary thing of man, and it is neither an energy nor a substance

The magnetic field is an imaginary thing, so how can there be mass

Magnetic field, a physical concept, refers to the field that transmits the magnetic force between physical objects. The magnetic field is a special field that cannot be seen or touched. A magnetic field is not made up of atoms or molecules, but a magnetic field exists objectively.

The magnetic field has the radiative properties of wave particles. There is a magnetic field around the magnet, and the interaction between the magnets is mediated by the magnetic field, so the two magnets do not need to be in contact at the physical level.

An electric current, a moving charge, a magnet or a change in the electric field present in the space around the space of a special form of matter. Since the magnetism of a magnet is the same as the current, the current is the movement of an electric charge, so in a nutshell, the magnetic field is generated by the change of the moving charge or electric field.

Basic characteristics: Similar to the electric field, the magnetic field is a vector field continuously distributed in a certain spatial area, and the basic physical quantity describing the magnetic field is the magnetic induction intensity vector b, which can also be vividly represented by magnetic inductance lines. However, as a vector field, the nature of the magnetic field is quite different from that of the electric field.

The magnetic field produced by a moving charge or a changing electric field, or the total magnetic field of the sum of both, is a vector field with no passive rotation, and magnetic field lines are closed clusters of curves, uninterrupted, and not crossed.

In other words, there is no source of emitting magnetic field lines in the magnetic field, and there is no tail of converging magnetic field lines, and the closure of the magnetic field lines indicates that the loop integral along the magnetic field lines is not zero, that is, the magnetic field is a rotational field instead of a potential field (conservative field), and there is no scalar function similar to the electric potential.

In quantum mechanics, scientists believe that pure magnetic fields (and pure electric fields) are the effects of virtual photons. In Standard Model terms, photons are the medium on which all electromagnetic interactions depend. In the low-field energy condition, the difference is negligible.

The above content reference: Encyclopedia - Magnetic Field.

Magnetic fields are substances. The magnetic field is a special substance that cannot be seen or touched, the magnetic field is not composed of atoms or molecules, but the magnetic field exists objectively. The magnetic field has the radiative properties of wave particles.

There is a magnetic field around the magnet, and the interaction between the magnets is mediated by the magnetic field, so the two magnets can act without physical contact.

From the point of view of modern physics, the only ultimate components of matter that can form a charge are electrons (with a unit negative charge) and protons (with a unit of positive charge), so the negative charge is a point object with a surplus electron nucleus, and the positive charge is a point object with a surplus proton. The real source of the field where the moving charge produces the magnetic field is the magnetic field produced by the moving electrons or moving protons. For example, the magnetic field generated by an electric current is the magnetic field generated by electrons moving in a wire.

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. For details, please refer to the references.

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.

I majored in physics. By definition, a magnetic field is a substance. I don't know how many times I've told this in books and from professors, so I can't be wrong.

Be! The magnetic field is a special substance that cannot be seen and touched, the magnetic field is not composed of atoms or molecules, but the magnetic field exists objectively. The magnetic field has the radiative properties of wave particles.

There is a magnetic field around the magnet, and the interaction between the magnets is mediated by the magnetic field. An electric current, a moving charge, a magnet or a change in the electric field present in the space around the space of a special form of matter.

No, it's a property of a magnet, not a substance that really exists.

The magnetic field has energy because the magnetic field is also matter and the magnetic field itself carries energy which is converted from other means.

Where does the energy in a magnet come from? A piece of non-magnetic iron is magnetized by a magnet, and where does the energy come from?

It is important to know that the formation of a magnet requires energy, and it does not spontaneously become a magnet. The magnet exhibits magnetism because the spin direction of each electron in it is almost identical, and energy is required to establish this consistency, such as at low temperatures. But lowering the temperature requires energy.

Magnets magnetize other irons to consume the energy of the original magnet.

The current in superconductivity can produce a magnetic field, but the electrical energy is not consumed, so the energy of the magnetic field comes from?

The electromagnetic field is a thing, and the establishment of this current (rather than the electromagnetic field) itself consumes energy, and its subsequent maintenance is not required.

Does energy is required to maintain the magnetic field, but energy is required to change the magnetic field?

No, you don't. Need.

There are three forms of existence of matter: particles, fields, and waves, and magnetic fields are fields.

A field is a way of being for an energy state. The existence of a magnetic field depends on magnetic energy, while an electric field depends on electrical energy.

The equation for the transition between mass and energy is e=mc 2, which is Einstein's theory of relativity.

We determine whether a magnetic field is matter or not because it is converted into energy by Einstein's theory of relativity. It is itself a way of being of energy. The appearance of light energy is a photon, and we can say that a photon is a substance.

The appearance of electrical energy is electrons, and we can also say that electrons are a substance. But the concept cannot be changed here, the appearance is not equivalent to that is, electrons and photons are microscopic substances, while electrical energy and light energy are a state after the transformation of matter, which is formless, but does exist. The same goes for magnetic fields!

For example, an electric field and a magnetic field are like two sides of the same coin, that is, 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.

There is no doubt that a moving charge creates a magnetic field. According to the relativity principle, even if it is a stationary point load, as long as another relative motion coordinate system is selected as the reference frame, the charge is also moving, and a magnetic field will be generated, and it is concluded that a magnetic field will be generated regardless of whether the charge is moving or not.

That is, if there is an electric field, there must be a magnetic field.

So is there a magnetic field and there must be an electric field? According to the Ampère hypothesis (which has been widely proven), the magnetic field is generated by the moving point charge, that is, it is clear that the magnetic field is inseparable from the electric field, that is, there must be an electric field if there is a magnetic field.

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

Similarities:Both the electric and magnetic fields are vector fields, i.e., both have magnitude and direction.

Differences:The electric field is an active field, i.e., the divergence is not zero, and the magnetic field is a passive field with zero divergence.

There are no closed electric field lines in the electric field, i.e., the electric field is a spin-free field. There are always closed magnetic field lines in the magnetic field, i.e., the magnetic field is a spin field.

Reasoning about the active nature of the electric field: there is a point charge, i.e., a unipolar electric field (positive and negative).

Corollary of the passivity of the magnetic field: there is no magnetic charge, i.e., there are no unipolar magnetons.

Just as the wind field is not a solid or liquid, but a phenomenon produced by another gaseous state, that is, the electric field and magnetic field are not substances, but a special substance that is the twin of matter. This special substance is a magnetic field when the state is unchanged, for example, if the wire is connected to direct current, then the magnetic field generated around the wire is the magnetic field. For example, when the wire is connected to alternating current, because the alternating current produces a changing magnetic field, then the inflection point of the change occurs, or when the magnetic field produces retrograde, in order to illustrate the fluctuation of the magnetic field energy before and after the inflection point, it is similar to the kinetic energy potential energy of the ball bouncing up and down, and the bounce generated by the fluctuation of magnetic field energy is the electric field and magnetic field.