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The Electric Field Due to a Charged Disk

  • Thread starter brcole
  • Start date
  • #1
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Homework Statement


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?


Homework Equations


E=σ/2ε(1-z/√(z^2+R^2 ))


The Attempt at a Solution



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

Answers and Replies

  • #2
Delphi51
Homework Helper
3,407
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I don't see it as an electric field question. The question asks "what charge ...".
 

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