Solving for force in vectors of Electric Field

1. Sep 29, 2011

ltruiz45

1. The problem statement, all variables and given/known data
The net force on the 1.0 charge in the figure is zero.
What is q?

2. Relevant equations

Please see attachment for question and image.
3. The attempt at a solution

I believed you would solve F =K|q1q2|/r2

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Last edited: Sep 29, 2011
2. Sep 30, 2011

MisterX

Write out the components of force that would be from each other particle on the center particle. Then set the sums for each component (one sum for up/down, one sum for left/right) equal to zero.

Or, first observe symmetry in the problem and realize one of these net force components is zero regardless of q.

Last edited: Sep 30, 2011