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!

Electric field from potential energy

  1. Oct 15, 2008 #1
    1. The problem statement, all variables and given/known data

    Consider uniform electric field. The values of the potentials at the points(0,0) (.5,0) are equal and 20V higher than the potential at (0,.5) The magnitude and direction of the electric field are:
    a)0
    b)40N/c j
    c)-40N/c j


    2. Relevant equations



    3. The attempt at a solution
    I know the answer is b because this is a problem for my exam review and we were given the solutions, I don't know how to get it though can anyone help?
     
  2. jcsd
  3. Oct 15, 2008 #2
    I think I know why. I am thinking that since the field points in the direction of decreasing potential it must go up and since Va-Vb = E(b)-E(a) you know the potential difference is 20. so 20=E(.5) (a=0) then divide out and get 40n/c j. Also you know that the field must be perpendicular to the x axis because as you move down the x axis the potential remains constant right? Can anyone verify this I have an exam tomorrow and I want to make sure I have the concepts right. Thanks.
     
  4. Oct 16, 2008 #3

    Redbelly98

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    You're reasoning is correct.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Electric field from potential energy
Loading...