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  4. In an ac circuit, an inductor, a capacitor and a resistor are connected in series with XL=R=XC. Impedance of this circuit is:

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Q. In an ac circuit, an inductor, a capacitor and a resistor are connected in series with $X_{L}=R=X_{C}$. Impedance of this circuit is:

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Solution:

$Z =\sqrt{\left( X _{ L }- X _{ C }\right)^{2}+ R ^{2}}= R$
$ \because X _{ L }= X _{ C }$