In a series RLC circuit at resonance
- A. the impedance is maximum and the current minimum
- B. the impedance is minimum and equal to the resistance, so the current is maximum
- C. the current is zero
- D. the capacitor and inductor can be removed without effect
Explanation
At resonance the inductive and capacitive reactances are equal and cancel, leaving only the resistance to oppose the current, so the current peaks sharply. The resonant frequency is 1 over 2 pi times the square root of LC. Tuning a radio means adjusting a capacitor until the resonant frequency matches the station wanted.
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