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Homework Help: Calculate the force that each wire exerts on each other

  1. Nov 6, 2007 #1
    need help asap...by 2:30 :(

    if 2 parallel conductors with the same length of .05m have their currents going in opposite directions, one conductor carries a current of 10A. C=D/3, D=24cm, I is adjusted so the magnetic field @ C=0.

    a. find the value of the current I
    b. value of magnetic field @ point A (find magnitude & direction)
    c. calculate the force that each wire exerts on each other
     
    Last edited by a moderator: May 8, 2015
  2. jcsd
  3. Nov 6, 2007 #2

    Astronuc

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    What is the formula for the magnetic field strength as a function of current and geometry.

    I take it that C = D/3 is measured from the wire with the 10 A current? Then the distance from C to the other wire is 2D/3.

    Does this look familiar - http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magcur.html


    Umm - where is A? One can use superposition of fields.
     
  4. Nov 6, 2007 #3
    A is at the midpoint of the first wire...
    A
    I <---------------------

    --------------------->10A
    C
     
  5. Nov 6, 2007 #4
    a is at the midpoint of the first wire, C is at the midpoint of the second wire...what is the equation?
     
  6. Nov 6, 2007 #5

    Astronuc

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    OK - but write the equation for the magnetic field due to a current in a wire, and determine the field due to 10A at D/3. The using that field and 2D/3, solve for the current in the other wire.

    Then knowing the currents, solve for the resultant field at A.

    See this - http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/wirfor.html
     
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