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Numerical · Q29

Q.A series LCR circuit has L=1 HL=1\ \text{H}, C=1 μFC=1\ \mu\text{F} and R=10 ΩR=10\ \Omega. Calculate

(a) its resonant frequency f0f_0,
(b) its quality factor QQ, and
(c) the bandwidth of resonance.
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Given: L=1 HL=1\ \text{H}, C=1 μF=1×10−6 FC=1\ \mu\text{F}=1\times10^{-6}\ \text{F}, R=10 ΩR=10\ \Omega.

  1. Resonant frequency.

    ω0=1LC=1(1)(10−6)=110−3=1000 rad/s\omega_0 = \frac{1}{\sqrt{LC}} = \frac{1}{\sqrt{(1)(10^{-6})}} = \frac{1}{10^{-3}} = 1000\ \text{rad/s}

    f0=ω02π=10006.283≈159.2 Hzf_0 = \frac{\omega_0}{2\pi} = \frac{1000}{6.283} \approx 159.2\ \text{Hz}

  2. Quality factor.

    Q=ω0LR=1000×110=100Q = \frac{\omega_0 L}{R} = \frac{1000\times1}{10} = 100

  3. Bandwidth. …

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