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NEET Sample Paper NEET Sample Test Paper-92

  • question_answer
    Figure shows a circuit in which three identical diodes are used. Each diode has forward resistance of \[20\,\,\Omega \] and infinite backward resistance. Resistors\[={{R}_{1}}={{R}_{2}}=50\Omega .\]Battery voltage is 6 V. The current through \[{{R}_{3}}\] is :

    A) 50 mA  

    B)        100 mA

    C) 60 mA  

    D)        25 mA

    Correct Answer: A

    Solution :

    [a] Here, diodes \[{{D}_{1}}\] and \[{{D}_{2}}\] are forward biased and \[{{D}_{3}}\] is reverse biased. Therefore current through \[{{R}_{3}}\] \[i=\frac{V}{R'}=\frac{6}{120}=\frac{1}{20}A=50\,mA\]


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