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Homework Help: Gauss's Law exercise, PLEASE HELP !

  1. Oct 18, 2009 #1
    1. The problem statement, all variables and given/known data
    A small conducting spherical Shell (#1) with inner radius a and outter radius b is concentric with a larger conducting spherical shell (#2) with inner radius C and outter radius d. The inner shell has a total charge (-3Q), and outter shell has a charge ( +5 Q).

    a) Use Gauss's law to find the electric field ( magnitude and direction) in terms of Q and r for

    i) r<a;
    ii) a<r<b;
    iii) b<r<c;
    iiii) c<r<d;

    b) determine the surface charge density on the inner and outer surfaces of both shells.

    3. The attempt at a solution

    Electric field for i and iii is zero?
    Last edited: Oct 18, 2009
  2. jcsd
  3. Oct 18, 2009 #2

    Here is the figure for the exercise.
  4. Oct 18, 2009 #3


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    Staff Emeritus
    Science Advisor
    Homework Helper

    Welcome to Physics Forums :smile:

    Can you show your work? You are supposed to make use of Gauss's law here.
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