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Need to find the current in a wire

  1. Apr 5, 2009 #1
    A wire 480 m long is in a 0.45 T magnetic
    field. A 3.56 N force acts on the wire.
    What current is in the wire? Answer in
    units of mA.


    I don't even really know where to start with this one. A friend of mine and I have been going through alot of equations but so far everytime there is an extra variable that we cannot find.
     
  2. jcsd
  3. Apr 5, 2009 #2
    Wow, I was making this way too difficult then it needed to be.

    I ended up using this equation:

    F/L*B=I
     
  4. Apr 6, 2009 #3
    that is the right eqn. while putting the values take care of proper units.
     
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