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

  • question_answer
    In an experiment with npn transistor amplifier in common emitter configuration, the current gain of the transistor is 100. If the collector current changes by \[1mA,\] what will be the change in emitter current?

    A)  \[1.1\,mA\]

    B)  \[1.01\,mA\]

    C)  \[0.01\,mA\]

    D)  \[10\,mA\]

    Correct Answer: B

    Solution :

    [b] \[\beta =\frac{\Delta {{i}_{c}}}{\Delta {{i}_{b}}},\] so  \[\Delta {{i}_{b}}=\frac{1\times {{10}^{-3}}}{100}=0.01\,\,mA\] \[\Delta {{i}_{e}}=\Delta {{i}_{b}}+\Delta {{i}_{c}}=0.01+1=1.01\,mA\]


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