With the gradual increase in frequency of an a. c. source, the impedance of an LCR series circuit
With the gradual increase in frequency of an a. c. source, the impedance of an LCR series circuit
first decreases, becomes minimum and then increases.
increases.
decreases.
remains constant.
Solution
We have the formula for Impedance
$\begin{aligned}
& \mathrm{Z}=\sqrt{\mathrm{R}^2+\left(\mathrm{X}_{\mathrm{l}}-\mathrm{X}_{\mathrm{C}}\right)^2} \\
& \mathrm{X}_{\mathrm{C}}=\frac{1}{\omega \mathrm{C}} \\
& \mathrm{X}_1=\omega \mathrm{L}
\end{aligned}$
And from the graph it can be easily seen that is Decreases first and then Increases.
