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JEE Main & Advanced Physics Alternating Current / प्रत्यावर्ती धारा Question Bank Self Evaluation Test - Alternating Current

  • question_answer
    Which one of the following curves represents the variation of impedance (Z) with frequency f in series LCR circuit?

    A)        

    B)

    C)

    D)

    Correct Answer: C

    Solution :

    [c] Impedance at resonant frequency is minimum in series LCR circuit. So,  \[Z=\sqrt{{{R}^{2}}+{{\left( 2\pi fL-\frac{1}{2\pi fC} \right)}^{2}}}\] When frequency is increased or decreased, Z increases.


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