1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Conducting Spherical Shells

  1. Mar 17, 2010 #1
    1. The problem statement, all variables and given/known data

    You have two concentric conducting sherical shells. the net charge in the inner shell is -8 C and the outer shell is neutral. In the inner hollow is placed a 2C point charge. Using Gauss's Law, find the charge on all 4 surfaces of the shells.

    2. Relevant equations

    Econductor = 0

    3. The attempt at a solution
    Inner radius of inner shell: -2C
    Outer radius of inner shell: -6C
    Inner radius of outer shell: 0
    Outer radius of outer shell: 0

    Not sure how to use Gauss's law here, or if the answers for the outer shell are right.
  2. jcsd
  3. Mar 17, 2010 #2


    User Avatar
    Homework Helper

    Try envisioning a Gaussian sphere that lies outside the inner radius of the inner sphere but inside the outer radius. Do the same for the outer sphere.
  4. Mar 17, 2010 #3
    I think this means the inner shell answers are correct, but not the outer. Is the outer shell going to have a -8 charge on the inner radius and a positive 8 charge on the outer?
  5. Mar 17, 2010 #4


    User Avatar
    Homework Helper

    Not -8. Think about how much charge there is inside the outer shell.
  6. Mar 17, 2010 #5
    Oh! There is -6C inside the outer shell. So 6C on the inner and -6 on the outer.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook