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L = 80 μH = 80*10⁻⁶ H
fr = 4 MHz = 4*10⁶ Hz
C = ?
La frecuencia de resonancia de un circuito LCR en serie se define como:
fr = 1/(2π)
despejando C =1/(4π²Lfr²)
C =1/[4π²*80*10⁻⁶*(4*10⁶)²]
C = 19,79*10⁻¹²F
C = 19,79 pF (picofaradios)