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

  • question_answer
    A \[30\text{ }\mu F\] capacitor is connected to a 150V, 60 Hz AC supply. The rms value of current in the circuit is:

    A) 17 A                            

    B) 1.7 A

    C) 1.7 MA                         

    D) 2.7 A

    Correct Answer: B

    Solution :

    (b) 1.7 A Here, \[C=30\times {{10}^{-6}}F;{{V}_{rms}}=150\,V,v=60\,Hz\] Capacitive reactance \[{{X}_{C}}=\frac{1}{\omega C}=\frac{1}{2\pi vC}=88.46\,\Omega \] \[{{l}_{rms}}=\frac{{{V}_{rms}}}{{{X}_{C}}}=\frac{150}{88.46}=1.7\,A\]


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