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Homework Help: Two parallel wires connected to equal alternating currents

  1. Mar 24, 2017 #1
    1. The problem statement, all variables and given/known data

    Two parallel wires connected to equal sinusoidal alternating currents with a phase difference of pi rad. How does the force of attraction vary with time (draw a graph)?

    Q from here: https://isaacphysics.org/questions/parallel_plates?board=70437f0a-1ec0-46f4-b3d5-9b6de05311dd

    2. Relevant equations

    F = bqvsintheta
    F = Bilsintheta

    3. The attempt at a solution

    I drew the wires with currents going in opposite directions due to the ACs being exactly out-of-phase. My thought is that with the right-hand grip rule, the magnetic field lines point in opposite directions and thus cancel out resulting in no force of attraction at any point but that's wrong.
  2. jcsd
  3. Mar 24, 2017 #2


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    Homework Helper
    Gold Member

    Is the force exerted by one wire on the other in the same direction as the magnetic field?
  4. Mar 24, 2017 #3


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    Staff: Mentor

    @FelaKuti : I notice that this thread has been marked solved. Has the problem really been solved to your satisfaction?
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