Advanced Qualification · A-001 Advanced theory · A-001-003-005
What is the resonant frequency of a series RLC circuit, if R is 47 ohms, L is 3 microhenrys and C is 40 picofarads?
- A14.5 MHz
- B13.1 MHz
- C13.1 kHz
- D14.5 kHz
Correct answer: A — 14.5 MHz. From the official ISED question bank, verified word for word.
Why
The resonant frequency of 14.5 MHz is right because the formula 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 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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