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  4. In a Bipolar Junction Transistor (BJT) , the current gain β is defined is

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Q. In a Bipolar Junction Transistor $ (BJT) $ , the current gain $ \beta $ is defined is

AMUAMU 2012Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

In a Bipolar Junction Transistor $(BJT)$, the current gain $\beta$ is defined as the ratio of change in collector current to change in base current for constant collector voltage in collector-emiitter configuration
i.e., $\beta = \frac{\Delta I_c}{\Delta I_B}$