Advanced Qualification · A-001 Advanced theory · A-001-004-007
What is the resonant frequency of a parallel RLC circuit if R is 4.7 kilohms, L is 40 microhenrys and C is 6 picofarads?
- A10.3 MHz
- B6.63 MHz
- C6.63 kHz
- D10.3 kHz
Correct answer: A — 10.3 MHz. From the official ISED question bank, verified word for word.
Why
The resonant frequency depends only on the inductor and capacitor values, ignoring the resistor, so plugging 40 microhenrys and 6 picofarads into the standard formula yields 10.3 MHz. 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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