Advanced Qualification · A-001 Advanced theory · A-001-004-009
What is the resonant frequency of a parallel RLC circuit if R is 4.7 kilohms, L is 200 microhenrys and C is 10 picofarads?
- A 3.56 kHz
- B 7.96 MHz
- C 7.96 kHz
- D 3.56 MHz
Correct answer: D — 3.56 MHz. From the official ISED question bank, verified word for word.
Why
The resonant frequency is 3.56 MHz because it depends only on the inductor and capacitor values, not the resistor. The full explanation — and one for every question — is in Pro.
Practise this section
Advanced theory: time constants, reactance, impedance, resonance, Q, and the mathematics behind tuned circuits.