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Where can I find an electric field calculator?

I'm looking for something that can use "x" (or any varable) as a point charge.

specifically, I'm looking for something that can I can imput the field (672 N/C) and the distance between two charges (.253 m) and x and -x as each point charge (equal and opposite).

I tried using WolframAlpha but couldn't...

Does such a calcultor exist?

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It's less than clear what exactly you want, but I'm pretty sure Wolfram|Alpha can calculate it. – leftaroundabout Sep 28 '11 at 13:14
I believe this falls under the same category as questions about e.g. Mathematica, namely tools used to do physics rather than the physics itself. If you were asking about the formula you could use to calculate the electric field, that would be a different matter, although that formula can be found in any basic reference work on electromagnetism so it wouldn't be a particularly insightful question anyway. – David Zaslavsky♦ Sep 28 '11 at 17:46

closed as off topic by David Zaslavsky♦ Sep 28 '11 at 17:43

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