Regarding the question of electric field origin, is the electric field active or passive?

In fact, it is impossible for an electric charge to exist independently of the electric field, and if there is an electric charge, there must be an electric field around it. On the other hand, an electromagnetic field can exist independently of an electric charge, and a photon is an electromagnetic field, but it is not charged.

Although it seems that electric fields are generated by electric charges, in reality they are equal, and there is no question of who produces whom, but once they appear together, there must be a distributional correlation.

In the very early universe, there were no particles, and at that time the whole universe was filled with radiation fields, and it was only later that particles such as electrons were produced due to the cooling caused by the expansion of the universe. Therefore, a brother said that the field is the only way for matter to exist, which is currently recognized by physics. According to quantum field theory, the vacuum is the ground state of the field, and the particle is nothing but the excited state of the field.

It's just different ways of expressing the same objective existence. So, the electric charge and the electric field around the charge can be understood as different sides of the same physical object.

It's also convenient to think about Gauss's theorem when you use Gauss's theorem in middle and high school, but it's awkward, it's problematic, so it's not clear, I suggest you look at a brief history of time and the universe in the shell, there will be a feeling that it's not easy to express to others but you seem to understand something.

Where there is an electric charge, there will be an electric field, but where there is no charge, there may also be an electric field, which is precisely the electromagnetic field, which is the medium through which the electromagnetic force interacts. In addition, modern physics believes that field is a way of existence of matter, and I strongly doubt that field is the only way for matter to exist, and matter is nothing more than a field confined to a small space. I hope I can have time to talk to the landlord.

You don't know enough about electric charges.

Magnetic fields can also produce electric fields.

The electric field is the active field. Explain that the electric field is the formula for the active field: f kq1q2 r2 (in a vacuum).

Two kinds of charges, the law of conservation of charge, and the meta-charge.

e＝；The amount of charged body charge is equal to an integer multiple of the element charge. The strength of the electric field at a point in the electric field.

The direction of the electric field force at the point of the test point charge (positive charge) at the point of the Zi Mo Bridge can be used.

the direction of the electric field; The strength of the electric field can be determined by the ratio of the force on the test charge to the charge charge at the test point.

Electrostatic field. This stationary charge is known as the field source charge, which is simply called the source charge. Electric field lines for electrostatic fields.

Starts with a positive charge or infinity and ends at infinity or a negative charge. The direction of the electric field line of the electrostatic field is closely related to the field source charge. When the source charge is positive, the electric field lines of the electric field are divergent; When the source charge is negative, the electric field line of the electric field is convergent.

The work done by the electric field force moving the charge has the characteristic of being path-independent.

The electric field is the spinless field, which is the active field. The steady magnetic field is a spinless passive field, and its magnetic field strength is not affected by other factors, while the magnetic field in the electrogenerated magnetism in the non-steady magnetic field is generated by the current, and the magnetic field is not generated when the current is not passed.

The magnetic field is an active field, and the electric field is a passive field. （）

a.That's right. b.Mistake.

Correct car elimination answer: bridge guess b