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12th Class Physics Alternating Current / प्रत्यावर्ती धारा Question Bank MCQ - Alternating Currents

  • question_answer
    At resonance frequency the impedance in series LCR circuit is:

    A) maximum                     

    B) minimum

    C) zero                  

    D) infinity

    Correct Answer: B

    Solution :

    (b) minimum At resonance frequency, the inductive and capacitive reactance are equal. \[\therefore {{X}_{L}}={{X}_{C}}\] Impedance, \[Z=\sqrt{{{R}^{2}}+{{\left( {{X}_{L}}-{{X}_{C}} \right)}^{2}}}=\sqrt{{{R}^{2}}+{{0}^{2}}}=R\]


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