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In this question I am asked to "Calculate the size of the electric field at k". See image at: http://capa-new.colorado.edu/msuphysicslib/Graphics/Gtype54/prob04a_threeqcontour.gif

Note: although the picture states "Volts", everything is actually measured in kV.

## Homework Equations

∆V = Ed

## The Attempt at a Solution

I tried to set V = -5kV, and solving for E by measuring the distance from point k to Q1, but this doesn't seem to work. Will I have to do this for all three charges? Or, am I totally off base and should be approaching it from a different angle?

Thanks for your help!

-Max