# For very high frequency AC supply, a capacitor behaves like a pure conductor. Why ?

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For very high frequency AC supply, a capacitor behaves like a pure conductor. Why ?

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The reactance of a capacitor is XC = $$\frac{1}{2 \pi f C}$$, where f is the frequency of the AC supply and C is the capacitance of the capacitor. For very high frequency, f, XC is very small. Hence, for very high frequency AC supply, a capacitor behaves like a pure conductor.