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BHU PMT BHU PMT (Mains) Solved Paper-2008

  • question_answer
    In a transistor circuit the base current changes from\[30\text{ }\mu A\]to\[90\text{ }\mu A\]. If the current gain of the transistor is 30, the change in the collector current is

    A)  4mA                                     

    B)  2 mA

    C)  3.6mA                                 

    D)  1.8mA

    Correct Answer: D

    Solution :

                     \[\beta =\frac{\Delta {{i}_{C}}}{\Delta {{i}_{B}}}\] \[\therefore \]  \[30=\frac{\Delta {{i}_{C}}}{90-30}\]                 \[\Delta {{i}_{C}}=30\times 60\]                 \[=1800\mu A=1.8\,mA\]


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