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!

Continuous Charge Distributions

  1. Jul 6, 2014 #1
    1. The problem statement, all variables and given/known data

    A charge lies on a string that is stretched along an x axis from x = 0 to x = 3.00 m; the charge density on the string is a uniform 9.00 nC/m. Determine the magnitude of the electric field at x = 8.00 m on the x axis.

    2. Relevant equations
    \int_0^3 kλ/(8-x)^2\,dx
    3. The attempt at a solution


    I know k and λ can come out of the integral leaving 1/(8-x^2). which gives me 9.44e-10 which webassign marks wrong.
  2. jcsd
  3. Jul 6, 2014 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Education Advisor

    Your set-up looks fine, but I don't get anything close to the numerical answer you're getting.
  4. Jul 6, 2014 #3


    User Avatar
    Homework Helper
    Gold Member
    2017 Award

    Are you thinking about the units for λ?
  5. Jul 6, 2014 #4
    Problem was the units for λ. Thanks for your help
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted