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Electrostatics: How to model a conductor in COMSOL?

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Hi!

I am trying to simulate a very simple system. I have two metal plates with a gap between them, placed in a box of "Air". One plate has a potential of 4000 V and the other is at 0 V. When I apply the material "Copper" to the plates from the library, the relative permittivity of it is given by default as 1. On simulating this I get very high potential all through the air box of around 2000 V except at the plates which is a gradient. And when I set the relative permittivity to 10e10 (very high value), I get zero potential through the box except at the high potential plate where there is a gradient.

So my question is: What is the correct way to model a conductor? How do you deal with the permittivity default value?

Thanks!

-Shagun

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