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JEE Main & Advanced Physics Communication System / संचार तंत्र Question Bank Mock Test - Electronic Devices Communication Systems

  • question_answer
    Assume that the silicon diode in the circuit requires a minimum current of 1 m A to be above the knee point (0.7 V) of I-V characteristics. Also assume that the voltage across the diode is independent of current above the knee point. If \[{{V}_{B}}\]= 5 V, then the maximum value of R so that the voltage is above the knee point is

    A) \[4.3k\Omega \] 

    B) \[2\,k\Omega \]

    C) \[1\,\Omega \]               

    D) 0

    Correct Answer: A

    Solution :

    [a] \[R=\frac{(5-0.7)V}{1\times {{10}^{-3}}}=\frac{4.3}{{{10}^{-3}}}\Omega =4.3\times {{10}^{3}}\Omega \]\[=4.3k\Omega \]


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