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

  • question_answer
    In an alternating current circuit consisting of elements in series, the current increases on increasing the frequency of supply. Which of the following elements are likely to constitute the circuit?

    A) Only resistor         

    B) Resistor and inductor

    C) Resistor and capacitor

    D) Only inductor

    Correct Answer: C

    Solution :

    (c) Resistor and capacitor Reactance of a capacitor,             \[{{X}_{C}}=\frac{1}{\omega C}=\frac{1}{2\pi vC}\] As frequency increases, \[{{X}_{C}}\] decreases and therefore current increases. As R does not vary with frequency, therefore, likely currents constituting the circuit may be capacitor and resistor.


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