1.

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

Answer»

`R=20 Omega, L=1.5 H , C=35 MUF`
`R=25 Omega, L=2.5 H , C=45 muF`
`R=15 Omega , L=3.5 H, C=30 muF`
`R=25 Omega , L=1.5 H, C=45 muF`

SOLUTION :Q factor for an L-C-R circuit is given by
`Q=1/R sqrt(L/C)`
where R = RESISTANCE, L = induction, C =capacitance
For better tuning of an L-C-R circuit, quality factor of the circuit must be as high as POSSIBLE. For this R should be low, L should be high and C should be low.


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