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  4. An LCR circuit as shown in the figure is connected to a voltage source Vac whose frequency can be varied. The frequency, at which the voltage across the resistor is maximum, is:

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Q. An $LCR$ circuit as shown in the figure is connected to a voltage source $V_{ac}$ whose frequency can be varied.
The frequency, at which the voltage across the resistor is maximum, is:Physics Question Image

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Solution:

Frequency $f=\frac{1}{2\pi\sqrt{LC}}$
$=\frac{1}{2\times3.4\sqrt{24\times2\times10^{-6}}}$
$\simeq 23Hz$