MHT CET 2024 Physics question

With gradual increase in frequency of an a.c. supply, the impedance of an LACR series circuit

(A)increases
(B)decreases
(C)remains constant
(D)first decreases, becomes minimum and then increasesCorrect

Answer: (D)

Solution

The impedance of a series LCR circuit is . At low frequency dominates () and the net reactance falls as rises, so decreases. At the resonant frequency , and $Z =

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Question ID VK-096788