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Impedance of a capacitor oscillated by a square wave

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lallaby

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Dear all,
If I excited a capacitor with a square wave with frequency f, what is the impedance of the capacitor C?
Since a square wave contains odd harmonics of its base frequency, when I only consider the second harmonic which has the frequency of 3f, what will the impedance of the capacitor be, 1/2pi(3f)C or 1/2pi(f)C? I think it should be the former one, right?

Regards,
lallaby
 

The question makes no sense, the impedance is different for each frequency component of the square wave.
 

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    lallaby

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