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Question on dipole and electric fields

  1. May 21, 2007 #1
    1. The problem statement, all variables and given/known data




    Two dipoles are oriented as shown in the diagram below. Each dipole consists of two charges +q and -q, held apart by a rod of length s, and the center of each dipole is a distance d from location A. If q = 3 nC, s = 1 mm, and d = 7 cm, what is the electric field at location A?

    Hint: draw a diagram and show the direction of each dipole's contribution to the electric field on the diagram (you do not have to turn in the diagram).
    look at picture below:
    http://www.prism.gatech.edu/~bpark6/two_dipolesA.gif

    2. Relevant equations

    E= [1/(4*pi*E)] * [q*s] * [1/r^3]
    where [1/(4*pi*E)] ~= 9E9
    and q = charge
    s = distance between dipole in meters
    r = distance between the location and the center of the dipole in meters

    3. The attempt at a solution

    the answer has to be in a format of < x, y, z >N/C
    and i used the perpendicular axis equation for the x axis and dipole axis equation for the y axis and got..
    <78.72, 157.43, 0> N/C , and i tried all different kinds of combination of + and - for the sign, and got it wrong. I am on 4/5 submission and this is my last submission, so if any help, it will be greatly appreciated. Thanks in advance.
     
  2. jcsd
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