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!

Electrostatic potential

  1. Dec 3, 2007 #1
    1. The problem statement, all variables and given/known data
    (Objective type question)
    Consider a square ABCD of side a, with charges +q, -q, +q, -q placed at the vertices, A, B, C, D in a clockwise manner. The electrostatic potential at some point located at distances r(r>>a) is proportional to?

    2. Relevant equations

    [tex]V =\frac{1}{4\pi \epsilon_0}\sum_i \frac{q_i}{R_i}[/tex]

    3. The attempt at a solution

    From the equation for the electrostatic potential is the obvious that V will be proportional to 1/r. I am a little confused by the options given to me...so just want to confirm.

    Other options:
    a] Constant
    b] 1/r^2
    c] 1/r^3
  2. jcsd
  3. Dec 3, 2007 #2
    Hi reshma,it is the 1/r^3 which is the correct answer.Note that it is a quadrupole...You may wish to refer to Griffiths page 147.
  4. Dec 3, 2007 #3
    Thanks a billion, neelakash! I knew something was fishy with my answer...I never thought of the quadrapole moment.
  5. Dec 3, 2007 #4
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Electrostatic potential