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Resonance in RLC Circuit

If the resist...

Question

If the resistance in parallel with a parallel resonant circuit is reduced, the bandwidth

A

disappears

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B

becomes sharper

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C

increases

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D

decreases

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Solution

The correct option is D decreases
D

We have bandwidth $= \frac{f_{r}}{Q}$

Where

$f_{r} =$ resonance frequency

$Q =$ quality factor

$Q = \frac{1}{R \sqrt{L C}}$

So if $R$ decreases $Q$ increases and if $Q$ increases bandwidth decreases.

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