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Homework Help: Current - two parallel conductors

  1. Nov 7, 2009 #1
    1. The problem statement, all variables and given/known data
    Two long parallel wires are separated by 4.0mm. The current in one of the wires is twice the other current. If the magnitude if the force on a 2.0m length of one of the wires is equal to 7.0μN, what is the greater of the two currents?

    2. Relevant equations

    3. The attempt at a solution
    I'm afraid I oversimplified my approach to this problem. I plugged the known values into the equation above and solved for I. I was then going to multiply that value by two. I am certain that is wrong, and that I am missing an important concept with regards to the problem. A shove in the right direction would be much appreciated!
    Last edited: Nov 7, 2009
  2. jcsd
  3. Nov 7, 2009 #2


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    Homework Helper

    I think you are going correct. I just can't recall the formula for the force, so I will assume the one you posted is correct.
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