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

Answer

C

Explanation

The LCR circuit used for communicaton should possess high quality factor (Q factor) or resonance, which is given by `Q = (1)/(R ) sqrt((L)/(C ))`
To make Q high , R should be low, L should be high and C should be low. Therefore, Choice (c ) is the best suited.