12th Class Physics Alternating Current / प्रत्यावर्ती धारा Question Bank Assertion And Reason (MCQs) - Alternating Current

  • question_answer
    Assertion: Capacitors serves as a block for D.C. and offers an easy path to A.C.
    Reason: Capacitance reactance is inversely proportional to frequency.
     

    A) If both assertion and reason are true and reason is the correct explanation of assertion.

    B) If both assertion and reason are true and reason is not the correct explanation of assertion.

    C) If assertion is true but reason is false.

    D) If both assertion and reason are false.

    E) If assertion is false but reason is true.

    Correct Answer: A

    Solution :

    The capacitive reactance of capacitor is given by \[{{X}_{C}}=\frac{1}{\omega C}=\frac{1}{2\pi \,fC}\]. So this is infinite for D.C. (f = 0) and has a finite value for A.C. Therefore a capacitor blocks D.C. and offers an easy path for A.C.


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