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Guest
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 Posted:
Mon Dec 12, 2005 5:35 pm Post subject:
Is magnetic field affected by metal conductor? |
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Hi,
Is magnetic field affected by metal conductor?
How metal works with electric field, magnetic field, and
electromagnetic field?
Thanks,
SP
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Reg Edwards
Guest
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| Posted:
Mon Dec 12, 2005 5:35 pm Post subject:
Re: Is magnetic field affected by metal conductor? |
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| Quote: | Maxwell's equations are the most compact description that covers all
these possibilities.
=============================== |
I'm not convinced. Who is Maxwell anyway?
---- |
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Doug Smith W9WI
Guest
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| Posted:
Mon Dec 12, 2005 5:35 pm Post subject:
Re: Is magnetic field affected by metal conductor? |
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Reg Edwards wrote:
| Quote: | Maxwell's equations are the most compact description that covers all
these possibilities.
===============================
I'm not convinced. Who is Maxwell anyway?
|
The worst nightmare of many an engineering student?
--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com
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James T. White
Guest
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| Posted:
Mon Dec 12, 2005 5:35 pm Post subject:
Re: Is magnetic field affected by metal conductor? |
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"Reg Edwards" <g4fgq.regp@ZZZbtinternet.com> wrote in message
news:dnk9lr$gsr$1@nwrdmz02.dmz.ncs.ea.ibs-infra.bt.com...
| Quote: | Maxwell's equations are the most compact description that covers all
these possibilities.
===============================
I'm not convinced. Who is Maxwell anyway?
----
|
http://en.wikipedia.org/wiki/James_Clerk_Maxwell
--
James T. White |
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Steve Nosko
Guest
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| Posted:
Mon Dec 12, 2005 5:35 pm Post subject:
Re: Is magnetic field affected by metal conductor? |
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Yes.
<prem.sivasamy@gmail.com> wrote in message
news:1134395344.665561.302220@f14g2000cwb.googlegroups.com...
| Quote: | Hi,
Is magnetic field affected by metal conductor?
|
Yes.
| Quote: | How metal works with electric field,
|
If you ask what is the effect of a conductor on a magnetic field,
then: Because metal conducts, it tends to block, divert, change the electric
field.
A changing magnetic field induces current in a conductor which in
turn causes a magnetic field that opposes the original magnetic field. This
new magnetic field sums with the original to form a completely new magnetic
field.
| Quote: | electromagnetic field?
|
Currents are induced in the conductor which sum to arrive at a
completely new electromagnetic field around the conductor.
You are welcome, 73, Steve, K,9.D;C'I |
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John Popelish
Guest
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| Posted:
Mon Dec 12, 2005 5:35 pm Post subject:
Re: Is magnetic field affected by metal conductor? |
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| Quote: | Hi,
Is magnetic field affected by metal conductor?
How metal works with electric field, magnetic field, and
electromagnetic field?
Thanks,
SP
|
Metals get involved with magnetic fields in two possible ways. All
metals (and anything else with a finite conductivity) circulate
current as any magnetic field passing through it changes strength.
The circulating current creates a mirror image magnetic field that
partially cancels the one trying to penetrate the metal. For any non
superconducting metal, this process also consumes energy from the
field. These circulating currents are referred to as eddy currents.
Ferromagnetic metals (ones that are attracted to a magnet) also have
another effect. They act as a short cut for any magnetic field that
lasts long enough for the above effect to fade out, at least for field
strengths below their saturation limit. In other words, it takes more
work to create a given flux in air than it does to create the same
flux through iron. Since any effect that causes the total amount of
flux to increase, generates a force in the direction of motion that
allows the increase, this short cut effect is what causes iron to be
attracted to a magnet. The work the magnet can do in attracting the
iron is the work it took to build the field in air minus the lesser
work it takes to build that field through iron.
Things get more complicated for electromagnetic waves. Both the
electric field and magnetic field components of waves move surface
charges around as they pass by or reflect off of conductors.
Maxwell's equations are the most compact description that covers all
these possibilities.
That's enough hand waving for now. My arms are tired. ;-) |
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Don Stauffer
Guest
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| Posted:
Mon Dec 12, 2005 5:35 pm Post subject:
Re: Is magnetic field affected by metal conductor? |
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| Quote: | Hi,
Is magnetic field affected by metal conductor?
How metal works with electric field, magnetic field, and
electromagnetic field?
Thanks,
SP |
Depends on metal. A ferrous metal (like iron) WILL distort field lines.
A non ferrous conductor like copper or aluminum will not affect a
STEADY or DC magnetic field, but because of induction WILL effect an AC
magnetic field.
Curiously, however, it will affect the field in the opposite direction
to the effect of a ferrous metal. |
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Al
Guest
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| Posted:
Mon Dec 12, 2005 5:35 pm Post subject:
Re: Is magnetic field affected by metal conductor? |
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| Quote: | Hi,
Is magnetic field affected by metal conductor?
How metal works with electric field, magnetic field, and
electromagnetic field?
Thanks,
SP
|
repulsed by bismuth
attracted by iron
little effect by tin
different effects if magnetic field is dynamic |
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the_laughing_man
Joined: 21 Apr 2006
Posts: 6
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| Posted:
Sun Apr 23, 2006 2:27 am Post subject:
Re: Is magnetic field affected by metal conductor? |
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| Doug Smith W9WI wrote: | Reg Edwards wrote:
| Quote: | Maxwell's equations are the most compact description that covers all
these possibilities.
===============================
I'm not convinced. Who is Maxwell anyway?
|
The worst nightmare of many an engineering student?
--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com |
-----------------------------------------------
You got that right man. Out of all computer and electrical engineering, electromagnetics, especially dealing with fields, is my least favorite. MY most favorite part is VLSI design. |
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neon
Joined: 25 Feb 2006
Posts: 594
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| Posted:
Thu Aug 10, 2006 11:49 am Post subject:
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| I would like to interfere here a bit. most all metal are good conductors of electrons therefore not all can be magnetized or align the particles north to south and nobody mentioned distance as a factor it varies as distance varies as we all know by playing with permanents magnets. there is no WORK involved per say but just a force field after it is magnetized. |
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