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  4. With increase in frequency of an a.c. supply, the impedance of an LCR series circuit

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Q. With increase in frequency of an a.c. supply, the impedance of an LCR series circuit

Alternating Current

Solution:

$X_{L}=2 \pi f L, $
$X_{c}=\frac{1}{2 \pi f C}$
When $f$ is increased, $X_{L}$ will increase
,$X_{C}$ will decrease
So $X_{L}-X_{C}$ will increase, hence $z$ will increase