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AFMC AFMC Solved Paper-2008

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

    A) 50 V                                      

    B) 70 V

    C) 130 V                                    

    D) 10 V

    Correct Answer: A

    Solution :

    In LCR series circuit, \[V=\sqrt{V_{R}^{2}+{{({{V}_{L}}-{{V}_{C}})}^{2}}}\] \[=\sqrt{{{(40)}^{2}}+{{(60-30)}^{2}}}\] \[=\sqrt{1600+900}=\sqrt{2500}=50\,\text{volt}\]


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