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Homework Help: Net force on 3 parallel wires carrying current.

  1. Oct 16, 2012 #1
    1. The problem statement, all variables and given/known data
    You are given 3 wires parallel to each other
    (1)------> I
    http://www.webassign.net/knight/p32-38alt1.gif (not sure it this link works)
    I1=I2=I3 = 16A
    the distance between the wires is d=2cm

    length of the wires is l= 50cm

    2. Relevant equations

    I assume I need to use the μ0 * I1*I2*l/(2∏*d)

    3. The attempt at a solution
    I calculated that the middle wires force is 0
    but for the first wire I tried solving for the force for 1 on 2 and then 1 on 3 and subtracting them because wire 2 repels wire 1 and wire 3 attracts wire 1 I ended up with:
    Force 1 on 2 = .0128 N
    Force 1 on 3 = .0064 N
    I am pretty sure I converted the units correctly but the answer is wrong. Please help.
  2. jcsd
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