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of a capacitor is the negative number,

Another choice is to define capacitive reactance as a positive number,

In this case however one needs to remember to add a negative sign for the impedance of a capacitor, i.e. .

At , the magnitude of the capacitor's reactance is infinite, behaving like an open circuit (preventing any current from flowing through the dielectric). As frequency increases, the magnitude of reactance decreases, allowing

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