A series LCR circuit is shown in the figure. Where the inductance of 10 H , capacitance $40 \mu \mathrm{~F}$…
A series LCR circuit is shown in the figure. Where the inductance of 10 H , capacitance $40 \mu \mathrm{~F}$ and resistance 60 $\Omega$ are connected to a variable frequency 240 V source. The current at resonating frequency is
4A
2A
5.4A
5.8A
Solution
In LCR series circuit,
$\mathrm{L}=10 \mathrm{H}, \mathrm{C}=40 \mu \mathrm{~F}, \mathrm{R}=60 \Omega, \mathrm{~V}=240 \mathrm{v}$
At resonance, $Z=R=60 \Omega$
$\therefore$ Current, $I=\frac{V}{Z}=\frac{240}{60}=4 \mathrm{~A}$
