Question

A series LCR circuit resonates at 10 kHZ. If the capacitor is 0.01 $\mu$F, the inductance used is approximately

• A. 10 mH
• B. 25 mH
• C. 50 mH
• D. 100 mH

Answer 1

Answer: (B)

25 mH

Answer 2

$f=\frac{1}{2\pi}\frac{1}{\sqrt{LC}}, 10^{4} =\frac{1}{2\pi}\times\frac{1}{\sqrt{L\times10^{-8}}}, L\approx\frac{1}{40}H, L\approx25 mH$