# Homework Help: Finding q1,q2,q3; Electric charge problem

1. Feb 2, 2010

### Michael126

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

Referring to the figure, suppose q_2 is not known. Instead, it is given that q_1+q_2=-1.0. The figure is q1 q2 q3 all lined up in a row with q2 being negative and q1 and q3 being positive as the electric field lines from both q1 and q3 point towards the negatively charged q2. Find q1, q2, and q3.

2. Relevant equations
F=eE, F=qE, F= kQ/r^2

3. The attempt at a solution
I put q1+q2=-1.0 micro-coulombs into q1=-1.0 micro-coulombs-q2, and attempted to put that equation into the coulombs law equation but there are still two unkowns present, i cant seem to figure out where to go from there since no distance, E, or force is given.

Last edited: Feb 2, 2010
2. Feb 2, 2010

### Michael126

I also tried using the fundamental charge of 1.6*10^-19, but that proved to be ineffective as well, i did convert it to micro-coulombs

3. Jun 15, 2010

### rosen17

Did you ever get help in solving this?