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Homework Help: Parallel wires

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

    Two parallel wires are 6.8 cm apart, and
    each carries a current of 23.8 A.
    The permeability of free space is 4pi ×
    10−7 T · m/A.
    If the currents are in the same direction,
    find the force per unit length exerted by one
    of the wires on the other.
    Answer in units of N/m.

    2. Relevant equations

    F/L = (permeability)/(2*pi*d) * 2I


    3. The attempt at a solution

    F/L = (4*pi*10^-7 T*m/A)/(2*pi*0.068m) * 2(23.8 A)
    = 0.00014 N/m
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Oct 1, 2008 #2

    alphysicist

    User Avatar
    Homework Helper

    Hi Kris1120,

    This equation is not correct. Do you see what it needs to be?
     
  4. Oct 5, 2008 #3
    I^2 and not 2I!
     
  5. Oct 5, 2008 #4
    Thanks!
     
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