question_answer

With increase in frequency of an A.C. supply, the impedance of a series L-C-R circuit

A) remains constant.

B) increases.

C) decreases.

D) decreases at first, becomes minimum and then increases.

Correct Answer: D

Solution :

Option [d] is correct.

Explanation: The frequency graph of a series LCR circuit is as following

With increase in frequency, the impedance decreases at first, becomes minimum and then increases.