Calculate inductive and capacitive reactance across a frequency and find where they balance.
Inductive reactance rises with frequency while capacitive reactance falls, so every LC pair has exactly one frequency where they cancel. Below it the circuit is capacitive, above it inductive. This crossover is what makes LC circuits frequency-selective and underlies every filter, tuner and oscillator.
Reactance
X_L = 2πfL; X_C = 1 ÷ (2πfC); they cancel at f = 1 ÷ (2π√(LC))
X_L = 2πfL; X_C = 1 ÷ (2πfC); they cancel at f = 1 ÷ (2π√(LC)) Inductive reactance rises with frequency while capacitive reactance falls, so every LC pair has exactly one frequency where they cancel. Below it the circuit is capacitive, above it inductive.
This crossover is what makes LC circuits frequency-selective and underlies every filter, tuner and oscillator.
This calculator takes 3 inputs: Inductance, Capacitance, Frequency. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.