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CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2004

  • question_answer
    In an LCR circuit the potential difference between the terminals of the inductance is 60 V, between the terminals of the capacitor is 30 V and that between the terminals of resistance is 40 V. The supply voltage will be equal to:

    A)  130 V                                   

    B)  10 V

    C)  50 V                                     

    D)  70 V

    Correct Answer: C

    Solution :

    Resultant potential difference (supply voltage of an LCR circuit is                 \[V=\sqrt{V_{R}^{2}+{{({{V}_{L}}-{{V}_{C}})}^{2}}}\]                 \[=\sqrt{{{(40)}^{2}}+{{(60-30)}^{2}}}\]                 \[=\sqrt{{{(40)}^{2}}+{{(30)}^{2}}}\]                 \[=\sqrt{{{(50)}^{2}}}\]                 \[=50\] volt


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