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Homework Help: Magnetic Vector Potential

  1. Jul 31, 2015 #1
    Not a homework question! I am doing exercises for upcoming final exam.

    So, I get stuck at question 5.27 (Griffith 4th edition textbook).

    Find the vector potential above and below an infinite uniform surface current with constant current sheet, K flowing at positive x direction.

    I get really stuck so I googled the answer and it shows like this:

    What I don't understand is, from the link there, why does equation (7) need negative sign? I mean, we already obtain a nice solution in equation (5).

    Help me please, thank you.
  2. jcsd
  3. Jul 31, 2015 #2


    Staff: Mentor

    That counts as homework as far as Physics Forums is concerned. This thread has been moved accordingly.

    Equation (5) is not a solution for the vector potential, which is what you are supposed to find. It's a solution for the integral of the magnetic field over a given area, which is equal to the line integral of the vector potential around its boundary. Try comparing equation (5) with equation (6).
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