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The current gain for a transistor working as a common-base amplifier is 0.96. If the emitter current is 7.2 mA, the base current will be

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0.42 mA

0.49 mA

0.35 mA

0.29 mA

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detailed solution

Correct option is D

Current gain of transistor iswhere ∆iC is change in collector current, and ∆iE is change in emitter current. Given α=0.96. ∆iE=7.2, ∆iC=0.96×7.2=6.91 mA Also ∆iE=∆iC+∆iB ∴∆iB =∆iE+∆iC=7.2-6.91=0.29 mA

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