RLC Circuits and Resonance

A 200 Ω resistor, a coil with 30 Ω of reactance, and a capacitor of unknown reactance are in series across an ac source. The circuit is at resonance. Circuit impedance is_____.

  • A. 230 Ω
  • B. 170 Ω
  • C. 200 Ω
  • D. Cannot be determined
Answer: Option C.

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