Question

An alternating currect is flowing through a series LCR circuit. It is found that the current reaches a value of \(1 \mathrm{~mA}\) at both \(200 \mathrm{~Hz}\) and \(800 \mathrm{~Hz}\) frequency. What is the resonance frequency of the circuit?
(A) \(600 \mathrm{~Hz}\)
(B) \(300 \mathrm{~Hz}\)
(C) \(500 \mathrm{~Hz}\)
(D) \(400 \mathrm{~Hz}\)

Answer 1

Ans:(D)
 \(f_{0}=\sqrt{f_{1} f_{2}}=\sqrt{200 \times 800}=400 \mathrm{HZ}\)

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