# Pure magnetic field

Chemist@
When charged particles aren't moving they produce an electric field. As the start to move and accelerate, the electric field intensity gets lower, but a magnetic field is being made and it increases in intensity. If the particles reach the speed of light will they produce pure magnetic field without the electric field?

An atom with unpaired electrons doesn't have a pure magnetic field, there is an electric one,too, right?

Nessdude14
The velocity of a particle effectively has no effect on the electric field at non-relativistic speeds. A moving particle will not have a lower intensity electric field. If the particle is moving at relativistic speeds, then the effects of Lorentz contraction will actually cause a higher-intensity field perpendicular to the velocity of the particle. When a particle is traveling near the speed of light, it will have the same electric field as if it were stationary, only it will be deformed by Lorentz contraction.

Homework Helper
When charged particles aren't moving they produce an electric field. As the start to move and accelerate, the electric field intensity gets lower, but a magnetic field is being made and it increases in intensity. If the particles reach the speed of light will they produce pure magnetic field without the electric field?
No.
An atom with unpaired electrons doesn't have a pure magnetic field, there is an electric one,too, right?
A "paired" electron is usually considered to be one that is paired with another electron with the opposite spin. But "unpaired electron" could be taken to mean that the number of electrons is not the same as the number of protons. So I am going to be careful:

An atom with the same number of electrons as protons also has an electric field.

Chemist@
The velocity of a particle effectively has no effect on the electric field at non-relativistic speeds. A moving particle will not have a lower intensity electric field. If the particle is moving at relativistic speeds, then the effects of Lorentz contraction will actually cause a higher-intensity field perpendicular to the velocity of the particle. When a particle is traveling near the speed of light, it will have the same electric field as if it were stationary, only it will be deformed by Lorentz contraction.

What happens with the magnetic field?

For now, thanks to both of you for the answers.