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Question

In LCR circuit, resonant frequency is 600 Hz and half power points are at 650 Hz and 550 Hz. The quality factor is

A
16
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B
13
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C
6
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D
3
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Solution

The correct option is C 6

Quality factor is given by
Q=f0Δf
where f0 is the resonant frequency and Δf is the difference between frequencies at half power points.
Putting values we get
Q=600650550=600100=6

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