J & K CET Medical J & K - CET Medical Solved Paper-2004

  • question_answer
    At high frequency, the capacitor offer :

    A)  more reactance                              

    B)  less reactance

    C)  zero reactance                

    D)  infinite reactance

    Correct Answer: B

    Solution :

                    Capacitive reactance is given by \[{{X}_{C}}=\frac{1}{\omega C}\] where C is capacitance and co the angular frequency.\[(\omega =2\pi f)\] \[\therefore \]  \[{{X}_{C}}=\frac{1}{2\pi fC}\] \[\Rightarrow \]               \[{{X}_{C}}\propto \frac{1}{f}\] Hence, when frequency\[f\]increases capacitive reactance decreases.


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