A circuit containing a resistor, capacitor and inductor where resonant frequency is met, what will the impedance of the circuit be?
- Maximum.
- Resistance across the resistor.
- Zero.
Explanation from PART66Online
At resonance the equal inductive and capacitive reactances cancel, so they contribute nothing to the opposition. The impedance of the series circuit therefore equals just the resistance of the resistor, which is its minimum value, not maximum or zero.
Wesley asked · 1 Jul 2026
The question does not say if the LCR circuit is in series or parallel.
Series RLC at resonance: XL and XC cancel, leaving only R. Impedance = low (just R, could be very low if R is small).
Parallel RLC at resonance: XL and XC still cancel in terms of reactance, but because the components are in parallel, this results in high impedance — approaching infinite in the ideal case
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