# Question on dipole and electric fields

1. May 21, 2007

### r3dxp

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 [Broken]

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.

Last edited by a moderator: May 2, 2017