Question

Consider an LRC series circuit. The impedance of the circuit increases if XC increases. When is this statement true?

Answer 1

at frequencies below resonance

Step-by-step explanation:

Below resonance, circuit impedance decreases as XC decreases with increasing frequency. Above resonance, circuit impedance increases as XL increases with frequency. Hence increasing circuit impedance will only accompany increasing XC below resonance (as frequency decreases).

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Below resonance, |XL| < |XC|, so XC dominates series impedance. Above resonance, the reverse is true.