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NEET Physics Semiconducting Devices NEET PYQ-Semiconducting Devices

  • question_answer
    A transistor is operated in common emitter configuration at \[{{V}_{C}}=2\text{ }V\] such that a change in the base current from \[100\,\,\mu A\] to \[300\,\,\mu A\] produces a change in the collector current from 10 mA to 20 mA. The current gain is                                                                                                                        [AIPMT (S) 2011]

    A)  75          

    B)  100

    C)                   25        

    D)  50

    Correct Answer: D

    Solution :

    \[\beta =\frac{\Delta {{I}_{C}}}{\Delta {{I}_{B}}}=\frac{(20-10)mA}{(300-100)mA}=\frac{10\times {{10}^{-3}}}{300\times {{100}^{-6}}}=50\]


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