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NEET Sample Paper NEET Sample Test Paper-29

  • question_answer
    A transistor-oscillator using a resonant circuit with an inductor L (of negligible resistance) and a capacitor C in series produce oscillations of frequency f. If L is doubled and C is changed to 4C, the frequency will be :-

    A)  \[\frac{f}{4}\]                                  

    B)  \[8\,f\]

    C)  \[\frac{f}{2\sqrt{2}}\]   

    D)  \[\frac{f}{2}\]  

    Correct Answer: C

    Solution :

    \[f=\frac{1}{2\pi \sqrt{LC}}\] &  \[f'=\frac{1}{2\pi \sqrt{2L(4C)}}\]     Therefore \[f'=\left( \frac{1}{2\sqrt{2}} \right)\,\,\frac{1}{2\pi \sqrt{LC}}=\frac{f}{2\sqrt{2}}\]   


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