1.

Which of the following combinations should be selected for better tuning of an L-C-R circuit used for communication ?

Answer»

R=15 `Omega`, L=3.5 H , C=30 `muF`
`R=25 Omega , L=1.5 H , C=45 muF`
`R=20 Omega , L=1.5 H, C=35 muF`
`R=25 Omega , L=2.4 H , C=45 muF`

Solution :For tuning of circuit Q factor should be large as possible
`Q=(omega_0L)/3=1/sqrt(LC)(1/R)=1/Rsqrt(L/C)[ because omega_0 =1/sqrt(LC)]`
`therefore` For large Q value R and C should be SMALL and L should be large which is possible in OPTION (A).


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