In an alternating current series RLC circuit, electrical resonance occurs when which condition is satisfied?
Answer and explanation
Correct answer: B. the inductive reactance exactly equals the capacitive reactance
- Step 1: Resonance in a series RLC circuit is defined when inductive reactance cancels capacitive reactance: X_L = X_C. Step 2. At resonance, net reactance is zero, making circuit impedance purely resistive and minimized (Z = R). Step 3. Current and voltage are perfectly in phase (phase angle = 0°). Answer: the inductive reactance exactly equals the capacitive reactance. Why not the others: Impedance is minimized at resonance, not maximized; current and voltage are in phase (lag is 0°); resistance does not vanish.
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