Hi,
Is magnetic field affected by metal conductor?
How metal works with electric field, magnetic field, and
electromagnetic field?
Thanks,
SP

In article .com,
wrote:

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

wrote:
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.

wrote:
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. ;-)

Maxwell's equations are the most compact description that covers all
these possibilities.
===============================

I'm not convinced. Who is Maxwell anyway?
----

"Reg Edwards" wrote in message
...
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

Reg Edwards wrote:
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

Heheh.

Good answer Doug!

Yes.

wrote in message
oups.com...
Hi,
Is magnetic field affected by metal conductor?

Yes.


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.


magnetic 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.


electromagnetic field?

Currents are induced in the conductor which sum to arrive at a
completely new electromagnetic field around the conductor.

Thanks,
SP


You are welcome, 73, Steve, K,9.D;C'I

Thanks a lot for all your responses. I have better understanding now.
Some of you have really taken time to explain in detail, you all are
very helpful people.Thanks again
SP
Steve Nosko wrote:
Yes.

wrote in message
oups.com...
Hi,
Is magnetic field affected by metal conductor?

Yes.


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.


magnetic 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.


electromagnetic field?

Currents are induced in the conductor which sum to arrive at a
completely new electromagnetic field around the conductor.

Thanks,
SP


You are welcome, 73, Steve, K,9.D;C'I