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JEE Main & Advanced Physics Semiconducting Devices Question Bank Self Evaluation Test - Semiconductor Electronics: Materials, Devices and Simple Circuits

  • question_answer
    A \[pnp\] transistor is used in common-emitter mode in an amplifier circuit. A change of \[40\mu A\] in the base current brings a change of \[2\text{ }mA\] in collector current and \[0.04\text{ }V\] in base emitter voltage. Which of the following is the correct value of the input resistor \[{{R}_{in}}\]?

    A)  \[{{R}_{in}}=9k\Omega \]

    B)  \[{{R}_{in}}=75\,k\Omega \]

    C)  \[{{R}_{in}}=1\,k\Omega \]

    D)  None of these

    Correct Answer: C

    Solution :

    [c] Input resistance \[{{R}_{in}}=\frac{\Delta {{V}_{BE}}}{\Delta {{i}_{B}}}=\frac{0.04}{40\times {{10}^{-6}}}=1k\Omega \]


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