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Homework Help: E field outside of two non conductive shells?

  1. Jul 4, 2014 #1
    1. The problem statement, all variables and given/known data

    Two non conductive shells surround each other, with radius r1, r2 and charges q1, q2 respectively.
    Find electric fields for E(r < r1), E(r1 < r < r2), E(r > r2)

    r1 is the inner shell, r2 is the outer shell (r1 < r2)

    2. Relevant equations

    I'm using gauss' law

    flux = E * A = q_enclosed / epsilon_not

    3. The attempt at a solution

    E(r < r1) = 0
    E(r1 < r < r2) = q1 / 4 * pi * episolon_not * r^2

    I'm confused on E(r > r2), what is the charged enclosed for two surrounding non conductive shells?
    Would I add up the charge from both (q1 + q2)? or would it only be the charge on the outer shell q2?

    I don't know what is significant about the shells being "non conductive" vs "conductive" what is the difference?

    please respond.
  2. jcsd
  3. Jul 4, 2014 #2


    User Avatar
    Gold Member

    q1 + q2

    No difference with conductive shells.
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