i just need to get this question over with(adsbygoogle = window.adsbygoogle || []).push({});

i tried and tried but i couldnt get the right answer plss anyone u.u

1. The problem statement, all variables and given/known data

point charges q1 = -6q and q2 = +3q are separated by distance d. Locate the point (measured from the origin at q1) at which the electric field due to the two charges is zero.

<img src=http://www.webassign.net/hrw/23_30.gif> [Broken]

2. Relevant equations

E=kQ/x^2

3. The attempt at a solution

well i did 0= E1+E2

i got this

0 = 3kQ/x^2 - 6kQ/(x+d)^2

6kQ/(x+d)^2 = 3kQ/x^2

cross multiplied

2x^2 = x^2 + 2dx + d^2

x^2 - 2dx - d^2 = 0

and then i did quadratic formula and got d-+d(sqrt2)

like 2.414d and .414 but as i put them in the webassign i got em wrong

can anyone help or tell what i did wrong or any feedback would be apreciated u.u

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Electric fields two point charges

**Physics Forums | Science Articles, Homework Help, Discussion**