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

Options

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

Answer

C

Explanation

Quality factor (Q) of an L-C-R circuit is given by,
`Q=1/Rsqrt(L/C)`
Where R is resistance, L is inductance and C is capacitance of the circuit. To make Q high,
R should be low, L should be high and C should be low.
These, conditions are best satisfied by the values, given in option (c).