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JEE Main & Advanced JEE Main Paper (Held on 7 May 2012)

  • question_answer
    In an LCR circuit shown in the following figure, what will be the readings of the voltmeter across the resistor and ammeter if an a.c. source of 220Vand 100 Hz is connected to it as shown?   JEE Main Online Paper (Held On 07 May 2012)

    A) 800V,8A              

    B)                        110V.1.1A

    C)                        300V, 3 A            

    D)                        220V, 2.2 A

    Correct Answer: D

    Solution :

                    In case of series RLC circuit, Equation of voltage is given by \[{{V}^{2}}=V_{R}^{2}+{{\left( {{V}_{L}}-{{V}_{C}} \right)}^{2}}\] Here,\[V=220V;{{V}_{L}}={{V}_{C}}=300V\] \[\therefore \]\[{{V}_{R}}=\sqrt{{{V}^{2}}}=220V\] Current \[i=\frac{V}{R}=\frac{220}{100}=2.2A\]


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