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JEE Main & Advanced Physics Semiconducting Devices Question Bank Junction Transistor

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    In an NPN transistor the collector current is 24 mA. If 80% of electrons reach collector its base current in mA is [Kerala PMT 2004]

    A)            36  

    B)            26  

    C)            16  

    D)            6

    Correct Answer: D

    Solution :

                       Given \[\ {{i}_{c}}=\frac{80}{100}\times {{i}_{e}}\]\[\Rightarrow 24=\frac{80}{100}\times {{i}_{e}}\]\[\Rightarrow {{i}_{e}}=30\,mA\] By using \[{{i}_{e}}={{i}_{b}}+{{i}_{c}}\] Þ  ib = 30 ? 24 = 6 mA.


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