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Finding the magnetic field

  1. Apr 25, 2008 #1
    1. The problem statement, all variables and given/known data

    Two parallel wires are 5.60 cm apart and carry currents in opposite directions, as shown in the figure.

    Find the magnitude of the magnetic field at point P due to two 1.50-\,{\rm mm} segments of wire that are opposite each other and each 8.00 {\rm cm} from P.


    2. Relevant equations



    3. The attempt at a solution
    I don't know what to us for r or i'm using the wrong equation

    but i used muenot Itop/(2pi r) + muenot I bottom/(2pi r) where r was the sqrt(8^2 +8^2)
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Apr 28, 2008 #2
    I think you should use the Biot-Savart Law.
     
  4. Apr 28, 2008 #3
    Can you rephrase that line so it is readable? I don't know what they are asking now...

    If they're asking the magnetic field for only small segments of the wire than yes, use Biot-Savart.

    If they're asking the magnetic field for large segments of the wire (nearing infinite in relation to the other distances) then you can probably use Ampere's law ( int B * dl = ...)
     
  5. Apr 28, 2008 #4
    got it

    I can't post pics yet. but i got it anyway I was using the wrong thing for r on each magnetic field.
     
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