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

Options

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

Answer

C

Explanation

For better tuning of an LCR circuit used for communication the circuit should possess highquality factor of resonance.
i.e., `Q=(1)/(R )sqrt((L)/(C ))` should be high.
For it R shouldbe low, L should be high and C should be low, therefore combination in option (c ) is correct.