Question

If the value of C in a series RLC circuit is decreased, the resonant frequency

• A. is not affected
• B. increases
• C. is reduced to zero
• D. decreases

Answer 1

The correct option is B increases

Resonant frequency in the series RLC circuit ${\nu }_r=\frac{1}{2\pi \sqrt{LC}}$
$⟹{\nu }_r\propto \frac{1}{\sqrt{C}}$
Thus resonant frequency of the circuit increases if the value of $C$ decreases.