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AIIMS AIIMS Solved Paper-2010

  • question_answer
    An AC ammeter is used to measure current in a circuit. When a given direct current passes through the circuit, the AC ammeter reads 3 A. When another alternating current passes through the circuit, the AC ammeter reads 4 A. Then the reading of this ammeter, if DC and AC How through the circuit simultaneously, is

    A)  3 A                                        

    B)  4 A                        

    C)         7 A                        

    D)         5 A

    Correct Answer: D

    Solution :

    Quantity of heat liberated in the ammeter of resistance R (i) due to direct current of 3 ampere                 \[\sqrt{\frac{2h}{g}}\] (ii) due to alternating current of 4 ampere \[\sqrt{\frac{h}{g}}\] Total heat produced per second \[\sqrt{3}\] Let the equivalent alternating current be \[\frac{R}{\sqrt{3}}\] virtual ampere; then \[\sqrt{\frac{3}{2}}R\] or            \[\frac{RT}{2V-b}-\frac{9}{4{{b}^{2}}},\]


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