Question

A resonant circuit has a lower critical frequency of $7kHz$ and an upper critical frequency of $13kHz$. The bandwidth of the circuit is

• A. $7kHz$
  
• B. $13kHz$
  
• C. $20kHz$
  
• D. $6kHz$
  

Answer 1

The correct option is D $6kHz$

Upper critical frequency $f_H=13kHz$

Lower critical frequency $f_L=7kHz$

Thus bandwidth of the circuit $f_{BW}=f_H-f_L$

$\therefore$ $f_{BW}=13-7=6kHz$