Which of the following combinations should be selected for better turning of an LCR circuit used for communication ?

Options

A. `R=15 Omega, L=3.5 H, C=30 muF`
B. `R=25 Omega, L=1.5 H, C=45 muF`
C. `R=20 Omega, L=1.5 H, C=35 muF`
D. `R=25 Omega, L=2.5 H, C=45 muF`

Answer

A

Explanation

For Better tuning, `Q`-factor must be high.
`:. Q=(omega_(0)L)/R=1/(sqrt(LC))(1/R) =1/Rsqrt(L/C)`
`R` and `C` should be small and `L` should be high.