Question

To increase the resonant frequency in series $LCR$ circuit,

• A. Source frequency should be increased.
• B. Another resistance should be added in series with the first resistance.
• C. Another capacitor should be added in series with the first capacitor.
• D. The source frequency should be decreased.

Answer 1

The correct option is C Another capacitor should be added in series with the first capacitor.

Resonant frequency $=\frac{1}{\sqrt{LC}}={\omega }_0$
$\Rightarrow$ If we decreases $C,{\omega }_0$ would increase
$\Rightarrow$ Another capacitor should be added in series.