1. Not finding help here? Sign up for a free 30min 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!

Net electric flux help?

  1. May 8, 2013 #1
    1. The problem statement, all variables and given/known data
    The charge distribution in the figure to the right is a cylindrical solid of charge q, radius R, and length H. The Gaussian surface S is a cylindrical shell with radius r and length h, with r > R. Determine the net electric flux given that q = 12Q, R = 5L, H = 6L, r does not apply, and h = 3L (type the integer value, along with the sign, without typing units Q/e0):


    2. Relevant equations
    "The net electric flux will be in units of Q/e0, with e0 the permittivity of free space."
    e0=8.85x10^-12

    3. The attempt at a solution
    have no idea how to do this. I tried q/e0 = 12/(8.85x10^-12) but its too huge value..maybe i got the wrong equation.

    edit; i just got this. turns out you didn't need ANY equations at all, just common sense. its just q*(h/H) which in this case is 6 though I have no idea why this is the answer, it would just give you the enclosed charge right? you would still have to divide by e0..?
     
    Last edited: May 8, 2013
  2. jcsd
  3. May 8, 2013 #2

    rude man

    User Avatar
    Homework Helper
    Gold Member

    Yes the net charge inside the Gaussian surface is qh/H but substitute q = 12Q and then ε0*(electric flux) = qh/H. The answer thus is electric flux = 12Qh/Hε0 but the answer is to be in units of Q/ε0 so what is the answer then? Does it help if I rewrite flux = (12h/H)(Q/ε0)?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Net electric flux help?
  1. Net electric flux (Replies: 2)

  2. Net Flux help (Replies: 0)

  3. Net electric flux (Replies: 2)

Loading...