Hello everyone. I have what is probably a relatively simple question. I'm trying to calculate the resistance between two rectangular copper plates submerged in water. I found this thread that briefly discusses it:(adsbygoogle = window.adsbygoogle || []).push({});

https://www.physicsforums.com/threa...ween-two-electrodes-filled-with-water.147144/

The equation:

R = (ρ*L)/A

seems pretty straight forward but I have a question about the area, A. Is the area in the equation the area of a single copper plate, or the sum of both plates?

For instance, if I have two parallel rectangular copper plates each with a surface area facing the other of 1 in^{2}, should I use 1 in^{2}, or 2 in^{2}in the equation? I'm thinking I should just use 1 in^{2}but I'm not sure.

Perhaps if someone can share or point me to a derivation of the formula, that would clarify things.

Thanks in advance for any help you can provide.

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# Resistance Between Two Rectangular Electrodes

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