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

  • question_answer
    In a transistor, the change in base current from \[100\mu A\] to \[125\mu A\] causes a change in collector current from \[5\text{ }mA\] to \[7.5\text{ }mA,\] keeping collector- to-emitter voltage constant at\[10\text{ }V\]. What is the current gain of the transistor?

    A)  \[200\]

    B)  \[100\]

    C)  \[50\]

    D)  \[25\]

    Correct Answer: B

    Solution :

    [b] Current gain \[=\frac{\Delta {{I}_{C}}}{\Delta {{I}_{B}}}\] when \[{{V}_{CE}}\] is constant. \[=\frac{2.5\times {{10}^{-3}}}{25\times {{10}^{-6}}}=0.1\times {{10}^{3}}=100\] \[[\Delta {{I}_{B}}=125\,\mu A-100\mu A=25\,\mu A\] \[\Delta {{I}_{C}}=7.5\,mA-5\,mA=2.5mA]\] 


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