BCECE Medical BCECE Medical Solved Papers-2012

  • question_answer
    A resistor R, inductor L and a capacitor C are connected in series to an oscillator of frequency v. If the resonant frequency is \[{{v}_{r}}\], theft the current lags behind the voltage, when

    A)  \[v=0\]

    B)  \[v<{{v}_{r}}\]

    C)  \[v>{{v}_{r}}\]

    D)  \[v={{v}_{r}}\]

    Correct Answer: C

    Solution :

    The current will lag behind the voltage when reactance of inductor is more than the reactance of capacitor l e.,                 \[\omega \,\,L>\frac{1}{\omega \,\,c}\] or            \[\omega >\frac{1}{\sqrt{LC}}\] or            \[2\pi v>\frac{1}{\sqrt{LC}}\]                 \[v>\frac{1}{2\pi \sqrt{LC}}\] or            \[v>{{v}_{r}}\] where \[{{v}_{r}}\] is the resonant frequency.


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