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Is magnetic field affected by metal conductor?

Discussion in 'Misc Electronics' started by [email protected], Dec 12, 2005.

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  1. Guest

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

    Al Guest

    repulsed by bismuth
    attracted by iron
    little effect by tin

    different effects if magnetic field is dynamic
     
  3. Don Stauffer

    Don Stauffer Guest

    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.
     
  4. 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. ;-)
     
  5. Steve Nosko

    Steve Nosko Guest

    Yes.

    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.

    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
     
  6. Reg Edwards

    Reg Edwards Guest

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

    I'm not convinced. Who is Maxwell anyway?
    ----
     
  7. The worst nightmare of many an engineering student?
     
  8. Guest

    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
     
  9. Conversely, a moving conductor interacts with a static magnetic field.

    Fred
     
  10. Guest

    Heheh.

    Good answer Doug!
     
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