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: Gauss's law and electric flux

  1. Jan 21, 2008 #1
    1. The problem statement, all variables and given/known data

    What is the net electric flux through the the torus if a=-6 nC and b=60 nC ?


    2. Relevant equations

    Electric flux=Qin/E

    3. The attempt at a solution

    I solved with Qin being 6*10^-9 C as it is the charge inside and E0=8.85*10^-12. I got 678 for electric flux. But it is wrong.
     

    Attached Files:

    Last edited: Jan 21, 2008
  2. jcsd
  3. Jan 21, 2008 #2

    G01

    User Avatar
    Homework Helper
    Gold Member

    [tex]\epsilon_0 = 8.85*10^{-12}[/tex] not [tex]8.85*10^{-9}[/tex].

    This may be your problem. If it is not, show your work and we may be able to give you more in depth help.
     
  4. Jan 21, 2008 #3
    I put the right value for E0. But, I am not sure if the charge I am using is right or not. Is the charge inside 60nC, 6nC or net charge?
     
    Last edited: Jan 21, 2008
  5. Jan 21, 2008 #4

    G01

    User Avatar
    Homework Helper
    Gold Member

    Is the +60nC charge contained inside the surface of the solenoid?
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook