Advanced Qualification · A-001 Advanced theory · A-001-004-011
What is the value of inductance (L) in a parallel RLC circuit, if the resonant frequency is 14.25 MHz and C is 44 picofarads?
- A 3.9 millihenrys
- B 0.353 microhenry
- C 2.8 microhenrys
- D 253.8 millihenrys
Correct answer: C — 2.8 microhenrys. From the official ISED question bank, verified word for word.
Why
At 14.25 MHz with a 44 picofarad capacitor, the math for resonance shows the inductor must be about 2.8 microhenrys to balance the circuit. 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.