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  4. The current gain of a transistor in common base mode is 0.995 . The current gain of the same transistor in common emitter mode is

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Q. The current gain of a transistor in common base mode is $ 0.995 $ . The current gain of the same transistor in common emitter mode is

KEAMKEAM 2007Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

$ \beta =\frac{\alpha }{1-\alpha } $
$ =\frac{0.995}{1-0.995} $
$ =\frac{0.995}{0.005} $
$ =199 $