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When the frequency of the ac voltage app...

When the frequency of the ac voltage applied to a series LCR circuit is gradually increased from a low value , the impedance of the circuit.

A

monotonically increases

B

first increases and then decreases

C

first decreases and then increases

D

monotonically decreases

Text Solution

Verified by Experts

The correct Answer is:
C
We Know`Z=sqrt((omegaL-1/(omegaC))^2+R^2)`
IF , `(dZ)/(domega)=0`then `omega=1/sqrt(LC)`
when `omegalt1/sqrt(LC)` then `(dZ)/(domega)le0` i.e., Z is a decreasing function. Again, when `omegagt1/sqrt(LC)`then`(dZ)/(domega)gt0` i.e., Z is a increasing function.
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