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Electric potential, hollow metalic cylinder

  1. Nov 27, 2011 #1
    A hollow metalic cylinder of radius r and lenght l, has potential V0 over its surface. The axis of the cylinder coincides with the z axis, and the cylinder is centered at the origin. The cylinder is placed paralel(the electric field paralel with z axis) to an otherwise uniform electric field E.
    I need the variation of electric potential V with z axis.
     
  2. jcsd
  3. Nov 28, 2011 #2

    Meir Achuz

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    The potential inside such a cavity would be a constant V_0.
     
  4. Nov 28, 2011 #3
    Why are you saying that it's constant V_0? The cylinder is not closed as far as I understand. It's like a toilet paper roll. If it were closed with lids, I'd see why, but in this case how would you explain?

    The boundary conditions are V_0 on the roll, and V_1 in one side, and V_2 in the other, such that (V_2-V_1)/l = E. If V_1 = V_2 = V_0 as you say, this means that E = 0, which is the trivial case.
     
  5. Nov 30, 2011 #4
    This is not perfectly valid, because it depends on the permitivity of the cylinder. According to Faraday a metall would shield away every electric field. But if you plot the field, you will see, that the field gets into the hollow space.
     
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