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NEET Sample Paper NEET Sample Test Paper-58

  • question_answer
    In a series LCR circuit the frequency of a 10V AC voltage source is adjusted in such a fashion that the reactance of the inductor measures\[15\Omega \] and that of the capacitor\[11\Omega \]. If\[R=3\Omega \], the potential difference across the series combination of L and C will be:

    A) 8V                               

    B) 10V    

    C) 22V                             

    D) 52V

    Correct Answer: A

    Solution :

    [a] \[{{X}_{L}}=15\Omega ,\,{{X}_{C}}=11\Omega ,R=3\Omega \] \[{{X}_{L}}-{{X}_{C}}=4\] Impedance \[(Z)=\sqrt{{{R}^{2}}+{{({{X}_{L}}-{{X}_{C}})}^{2}}}\] \[Z=\sqrt{{{(3)}^{2}}+{{(4)}^{2}}}\] \[Z=5\Omega \] \[I=\frac{V}{Z}=\frac{10}{5}=2A\]


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