Transistor

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Question

For a transistor, the current amplification factor $α = 0.9$ . This transistor is connected in common emitter configuration. When the base current changes by 0.4 mA, the change in collector current will be

Moderate

Solution

current gain $β = \frac{α}{1 - α} = \frac{0.9}{1 - 0.9} = 9$
collector current $I_{c} = {βI}_{b} = 9 \times 0.4 mA$ = 3.6 mA

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