negative capactance: by definition it is the difference of charges over voltage, delta_Q/delta_v. It is possible to have positive and negative numerically. Proper choice of delta_c might be important.
you may refer this example for resistance https://optics.ansys.com/hc/en-us/articles/360042328774-Traveling-Wave-Mach-Zehnder-Modulator
as now you have voltage and current.
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