Advanced Qualification · A-001 Advanced theory · A-001-004-008
What is the resonant frequency of a parallel RLC circuit if R is 4.7 kilohms, L is 10 microhenrys and C is 50 picofarads?
- A7.12 kHz
- B3.18 MHz
- C3.18 kHz
- D7.12 MHz
Correct answer: D — 7.12 MHz. From the official ISED question bank, verified word for word.
Why
The resonant frequency is 7.12 MHz because the calculation depends only on the inductor and capacitor values, while the resistor value does not change where resonance occurs. The full explanation — and one for every question — is in Pro.
Practise this section
Advanced theory is section A-001 of the Advanced exam: Advanced theory: time constants, reactance, impedance, resonance, Q, and the mathematics behind tuned circuits.
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