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

  • question_answer
    A capacitor of capacitance C has reactance X. If capacitance and frequency become double, then the capacitive reactance will be:

    A) 2 X                  

    B) 4 X    

    C) \[\frac{X}{2}\]                          

    D) \[\frac{X}{4}\]

    Correct Answer: D

    Solution :

    (d) \[\frac{X}{4}\]                         \[{{X}_{C}}=\frac{1}{2\pi vC}\]             \[\Rightarrow X{{'}_{C}}=\frac{1}{2\pi (2v)(2C)}=\frac{{{X}_{C}}}{4}\]


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