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Magnetic Field - Cavity

  1. Sep 22, 2014 #1
    1. The problem statement, all variables and given/known data
    A long conductive cylinder contains two cylindrical cavities, as shown in the diagram. Find the magnetic field produced at point P just above the surface of the cylinder, the total current in the I and uniform current density over its section.

    33bznk3.jpg

    2. Relevant equations

    Biot-Savart
    Ampere's law

    3. The attempt at a solution

    I tried to use ampere's law, but I'm a bit confused what I should do.
    I don't know very well what i can do, if someone could help i appreciate.
     
  2. jcsd
  3. Sep 22, 2014 #2

    Simon Bridge

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    Try to articulate the trouble you are having.

    You know how to find B due to a current in the whole wire right?
    I'm guessing the trouble is the holes - is that correct?
    So apply the superposition principle.
     
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