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Which of the following combinations shou...

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

A

`R=20 Omega`, L=1.5 H, `C=35muF`

B

`R=25 Omega`, L=2.5H, `C= 45muF`.

C

`R= 15 Omega`, L=3.5H, `C=30muF`

D

`R=25Omega`, L=1/5H, `C=45muF`

Text Solution

Verified by Experts

The correct Answer is:
B
For better tuning, peak of current growth must be sharp. This is ensured by a high value of quality factor Q.
Now, quality factor is given by `Q= 1/Rsqrt(L/C)`
From the given options highest value of Q is associated with `R=15Omega`, L=3.5 H and `C=30muF`
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