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How to get capacitance from potential FEM

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Hi guys,
I hope this is the correct section otherwise I apologize :).The goal is to find the capacity of a non linear capacitance composed by an upper plate which has a cup shape and the lower plate which is flat.
The problem is the following: by means of a FEM simulation of the Poisson equation I was able to find the potential but once I got it how can I get the capacitance?

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