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Homework Help: Electric Fields in Solid Sphere and Thick Shell

  1. May 20, 2007 #1
    1. The problem statement, all variables and given/known data
    What is the electric field at r1, r2, r3 for a solid sphere within a thick spherical shell where r1=1.5cm, r2=5.0cm, r3=8.0cm? The solid sphere has a total charge of 3C and the thick shell has a charge of -9C. a=2.0cm, b=4.0cm, c=6.0cm.
    (a=radius of solid sphere, b=inner radius of shell, c=outter radius of shell)

    not sure how to calculate/what happens to the electric field when r1 is inside a and b > r3 > c.
    they are insulating sphere and shell.

    2. Relevant equations
    \int_ \vec E. d\vec A = q_\text{enclosed}/\epsilon_0
    Eo = 8.85 * 10^ -12

    3. The attempt at a solution
    I solved r3 by using a gaussian surface and using the total charge as a whole.
    So then,
    EA = q enclosed/Eo
    E (4pi(.06)^2) = -6/8.85*10^-12
    got E = -1.5*10^13
    Last edited: May 20, 2007
  2. jcsd
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