Q 12-07-025NEETJEE MainEasy
The resonant frequency of a series LCR circuit is $f_0$. If both L and C are doubled, the new resonant frequency is
Answer: (D) $\dfrac{f_0}{2}$
$f_0 \propto \dfrac{1}{\sqrt{LC}}$; $LC$ becomes $4$ times, so $f$ halves.
Solution by Sreeraj P, M.Sc Physics