Question

Resonant frequency of a series LCR circuit is 600 Hz. Quality factor of the circuit is 4. Band width is

• A. 300 Hz
• B. 150 Hz
• C. 1200 Hz
• D. 450 Hz

Answer 1

Answer: (B)

150 Hz

Answer 2

Bandwidth of $LCR$ circuit is given by, $2 \Delta \omega = \frac{\omega_0}{Q}$ or $2 \Delta \upsilon = \frac{\upsilon_0}{Q}$ Here, $\upsilon_0 = 600 \: Hz , Q = 4$ $\therefore$ Band width $= \frac{600}{4} = 150 \, Hz$