The sharpness of resonance or Q value o...

The sharpness of resonance or Q value of resonant circuit with resonant frequency `f_r` and half power frequency `f_1` and `f_2` is

A

`Q = f_r/(f_2 - f_1)`

B

`Q = (f_2 - f_1)/f_r`

C

`Q = f_r/(f_2 + f_1)`

D

`Q = 1/(f_r (f_2 - f_1)`

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