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NEET Physics Semiconducting Devices NEET PYQ-Semiconducting Devices

  • question_answer
    For a transistor \[\frac{{{I}_{C}}}{{{I}_{E}}}=0.96,\] the current gain in common-emitter configuration is [AIPMT 2002]

    A)  6       

    B)   12      

    C)  24    

    D)  48

    Correct Answer: C

    Solution :

    Given \[\frac{{{I}_{C}}}{{{I}_{E}}}=\] current gain \[(\alpha )=0.96\]
                So, current gain in common emitter configuration is
                            \[\beta =\frac{\alpha }{1-\alpha }\]
                            \[=\frac{0.96}{1-0.96}-\frac{0.96}{0.04}\]
                            = 24
    Note:    The current gain \[\beta \] in common emitter mode is very large as compared to the current gain \[\alpha \] in common base mode. This is why a transistor is always used as an amplifier in the CE mode.


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