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  4. Current gain of a transistor in common base mode is 0.95. Its value in common emitter mode is

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Q. Current gain of a transistor in common base mode is $0.95$. Its value in common emitter mode is

Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

As, $\beta=\frac{\alpha}{1-\alpha}=\frac{0.95}{1-0.95}$
$=\frac{0.95}{0.05}=19$