Why the magnetic field is creating around electrons?


by scientist91
Tags: creating, electrons, field, magnetic
scientist91
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#1
May9-07, 12:01 PM
P: 133
Why magnetic field is creating around electrons when there is current in coductor? Why the magnetic field is not creating around protons?
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Sojourner01
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May9-07, 12:56 PM
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I don't understand what you're asking. Can you rephrase the question?
scientist91
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#3
May9-07, 01:23 PM
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Quote Quote by Sojourner01 View Post
I don't understand what you're asking. Can you rephrase the question?
Now look the question.

ZapperZ
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#4
May9-07, 01:30 PM
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Why the magnetic field is creating around electrons?


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
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#5
May9-07, 02:43 PM
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Quote Quote by ZapperZ View Post
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.
Can you answer me on the first question?
ZapperZ
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#6
May9-07, 02:49 PM
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Quote Quote by scientist91 View Post
Can you answer me on the first question?
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
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#7
May9-07, 05:29 PM
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Quote Quote by scientist91 View Post
Why magnetic field is creating around electrons when there is current in coductor? Why the magnetic field is not creating around protons?
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
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#8
May10-07, 06:46 AM
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Quote Quote by jtbell View Post
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.
what is a net nonzero velocity?
and is the electric field moving?
does magnetic field create around proton?
Ahmed Abdullah
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#9
May10-07, 06:59 AM
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When something has a net nonzero velocity; it is in motion.
Ahmed Abdullah
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#10
May10-07, 07:12 AM
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Quote Quote by scientist91 View Post
and is the electric field moving?
does magnetic field create around proton?
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
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#11
May10-07, 07:16 AM
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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
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#12
May10-07, 07:16 AM
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Quote Quote by Ahmed Abdullah View Post
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.
Then how is possible only to create magnetic field around the electron? Why it is not creating around proton?
Ahmed Abdullah
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#13
May10-07, 07:21 AM
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The origin of the magnetic field is the moving electrons but it is not confined around the electrons, though.
scientist91
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#14
May10-07, 07:34 AM
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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
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#15
May10-07, 07:44 AM
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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
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#16
May10-07, 07:58 AM
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Quote Quote by Ahmed Abdullah View Post
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.
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
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#17
May10-07, 07:59 AM
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Quote Quote by scientist91 View Post
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?
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.
Ahmed Abdullah
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#18
May10-07, 08:02 AM
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Quote Quote by scientist91 View Post
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?
There is no electric field to move.


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