Advanced Qualification · A-001 Advanced theory · A-001-004-002
What is the resonant frequency of a parallel RLC circuit if R is 4.7 kilohms, L is 2 microhenrys and C is 15 picofarads?
- A29.1 kHz
- B5.31 MHz
- C5.31 kHz
- D29.1 MHz
Correct answer: D — 29.1 MHz. From the official ISED question bank, verified word for word.
Why
The resonant frequency is 29.1 MHz because the resistance value does not change where the circuit naturally vibrates; only the inductor and capacitor matter. 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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