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Magnectic force on current carrying wire

  1. Jul 23, 2010 #1
    1. The problem statement, all variables and given/known data

    The net charge in a current-carrying wire is zero.Then,why does a magnetic field exert a force on it?

    2. Relevant equations

    dF=I*dl x B

    3. The attempt at a solution
    if we take a small portion of wire the net charge is zero,so if i take the frame of electrons that is im moving so i have a charge with me..and i get a force due to it..i dont know weather my explanation was correct or wrong??

    dont go to lorentz transformation to explain..(in case needed)..because i dont have the idea of relativity theory in maxwell equations..im saying this because i had read many post on similar kind of topic where every one finally explained with lorentz transformation..saying that in one frame its magnetism..its electricity in another frame..:confused:
  2. jcsd
  3. Jul 23, 2010 #2
    What does the net charge have to do with it? A moving charge will experience a force in a magnetic field via F = qv x B. The current is just a lot of negative charges moving, so the current should feel the same force. The positive charges are stationary, so there is no counter-balancing magnetic force on them.
  4. Jul 23, 2010 #3
    yes..thank u...
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