JCECE Engineering JCECE Engineering Solved Paper-2005

  • question_answer
    The resonant frequency of an \[LCR\] circuit occurs at a frequency equal to:

    A) \[\frac{1}{LC}\]                                

    B) \[\frac{1}{\sqrt{LC}}\]

    C) \[\frac{1}{LCR}\]                              

    D) \[\frac{1}{CR}\]

    Correct Answer: B

    Solution :

    Key Idea: Resonance occurs when capacitive reactance is equal to inductive reactance. At resonance              \[{{X}_{L}}={{X}_{C}}\] \[\therefore \]        \[{{\omega }_{0}}L=\frac{1}{{{\omega }_{0}}C}\] \[\Rightarrow \]               \[\omega _{0}^{2}=\frac{1}{LC}\] \[\Rightarrow \]               \[{{\omega }_{0}}=\frac{1}{\sqrt{LC}}\]


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