The Electric Field Due to a Charged Disk

  1. 1. The problem statement, all variables and given/known data
    A circular plastic disk with radius R = 1.80 cm has a uniformly distributed charge of Q = + 2.15 106 e on one face. A circular ring of width 30 µm is centered on that face, with the center of the ring at radius r = 0.50 cm. What charge is contained within the width of the ring?


    2. Relevant equations
    E=σ/2ε(1-z/√(z^2+R^2 ))


    3. The attempt at a solution

    e=8.85e-12
    o= 2.15e6
    z=.5 cm
    r= 1.8
    Ans=3.15 e10
     
  2. jcsd
  3. Delphi51

    Delphi51 3,410
    Homework Helper

    Chegg
    I don't see it as an electric field question. The question asks "what charge ...".
     
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