For a series R-L-C circuit, what is the correct expression for the resonant frequency (fr), and what is the circuit's electrical behavior at resonance?

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Physics · AC Circuits

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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Correct answer

fr = 12π√LC; current is maximum and impedance is purely resistive.

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Answer 1

fr = 12π√LC; current is maximum and impedance is purely resistive.

Answer 2

fr = 12π√LC; current is minimum and impedance is purely inductive.

Answer 3

fr = 12π√LC; current lags voltage by 90°.

Answer 4

fr = 12π√LC; current is zero and impedance is infinite.

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