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Today was the second time in a text book that they calculated capacitance using [tex]C = \frac{dQ}{dV}[/tex]. In my electromagnetics book and any sources I find online they use [tex]C = \frac{Q}{V}[/tex].

Can anyone help me understand why they can do it like this? This type of calculation was done to calculate the zero bias junction capacitance of a pn junction diode.

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# Homework Help: Why do some books use dQ/dV for capacitance?

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