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AC theoryQuestion 997 of 1506

What condition gives resonance in a parallel inductor-capacitor (tank) circuit?

  1. Inductance equals capacitance in value
  2. The circuit resistance is zero ohms
  3. The supply current is at its maximum value
  4. Inductive and capacitive reactances are equal
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Correct answer: Inductive and capacitive reactances are equal

Only one frequency makes the two reactances equal.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 6.2: Simple Parallel (Tank Circuit) Resonance

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Questions last reviewed: 18 October 2026