Question

To have large selectivity in a series LCR circuit

• A. L should be large, R should be small
• B. Both L and R should be large
• C. L should be small, R should be large
• D. Both L and R must be small

Answer 1

Answer: (A)

L should be large, R should be small

Answer 2

Quality factor of $LCR$ circuit is $Q = \frac{\omega_o L}{R}$ If $Q$ is large for $LCR$ circuit i.e. $R$ is low and $L$ is large then the circuit is more selective.