Why the magnetic field is creating around electrons?

scientist91

Why magnetic field is creating around electrons when there is current in coductor? Why the magnetic field is not creating around protons?

Sojourner01

I don't understand what you're asking. Can you rephrase the question?

scientist91

Now look the question.

ZapperZ

The 'speed' of electrons in a conductor cannot be mixed with the ones that are free. This is because electrons in a conductor can be approximated as an electron GAS, and thus, undergo collisions not just among themselves, but with the ions of the conductor. The end result is that the electrons have a CONSTANT DRIFT VELOCITY when there is an applied potential or field to the conductor.

This will not be true if these are free electrons since the Lorentz force will cause an acceleration.

BTW, you changed your question rather drastically. You should think things through a bit more before posing such questions.

Zz.

scientist91

Can you answer me on the first question?

ZapperZ

No, because the question doesn't make sense, and you are apt to CHANGE the damn thing again. This is an annoying habit that you need to stop, or else the thread makes no sense.

Zz.

jtbell

Do you mean, why do the electrons in a current-carrying wire produce a magnetic field but the protons do not? It's because the conduction electrons are moving (they have a net nonzero velocity along the wire) but the protons are not.

scientist91

what is a net nonzero velocity?
and is the electric field moving?
does magnetic field create around proton?

Ahmed Abdullah

When something has a net nonzero velocity; it is in motion.

Ahmed Abdullah

Nope, it is not. Though electrons flow through the conductor it has no net electric charge. Actually for every free electron contributing in electric current there is a positively charged ion nearby. The drift velocity of the electron is constant and electrons flow through the conductor uniformly without creating any polarity.

HallsofIvy

Protons are much more massive than electrons and do not move in a conductor. Since it is the motion of charge that causes a magnetic field, there is no magnetic field cause by protons.

scientist91

Then how is possible only to create magnetic field around the electron? Why it is not creating around proton?

Ahmed Abdullah

The origin of the magnetic field is the moving electrons but it is not confined around the electrons, though.

scientist91

The origin of the magneic field in the wire, is the electric field which is created with motion of the electrons. But the question is, is that electric field moving?

Ahmed Abdullah

No, motion of electrons inside the wire does not create any electric field as i have stated before.
ELECTRONS ARE MOVING WITHOUT CREATING ANY ELECTRIC FIELD INSIDE THE WIRE.
Whether stationary or in motion an electron has it's own electric field but it can be cancelled by positive charges standing nearby.
It is the moving charge (charge and electric field are not same ) which creates magnetic field -nothing more or less.

scientist91

I think you are confused. Look man, moving magnet among some conductor will produce current inside the wire(electro-induction). So the magnetic field created electric field, but also the electric field can create magnetic field. So it is not even logical what u are saying, that just moving of the electrons create magnetic field.

rcgldr

Technically, the field is the sum of moving components, but as each electron leaves one end of of a section of wire, another electron enters the other end, so that the net sum of these tiny fields doesn't move. Since a single electrons contribution to the total sum is so relatively small, the small variations in the electrical field are ignored. It's not practical to worry about what's going on at the atomic level when dealing with classical electical physics of currents and fields, which involve huge numbers of moving electrons.

Note that free electrons don't flow smoothly. They move at very high speed, almost randomly in all directions, occsionally being captured by atoms causing the release of a different electron. The movement is almost random, but there is a net flow of electrons when there is current. This net flow is extremely slow compared to the actual speed of the free moving electrons.