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Determine the value of emitter current and collector current of a transistor having α=0.98 and collector to base leakage current ICBO=4µA. The base current is 50µA.

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Determine the value of emitter current and collector current of a transistor having α=0.98 and collector to base leakage current ICBO=4µA. The base current is 50µA.

(a) 1.5mA

(b) 3.7mA

(c) 2.7mA

(d) 4.5mA

I have been asked this question in exam.

The query is from The Common Base Configuration in chapter Transistor Characteristics of Electronic Devices & Circuits

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The correct answer is (c) 2.7mA

The explanation: Given, IB=50µA=0.05mA

ICBO=4µA=0.004Ma

IC=α/(1- α)IB+1/(1- α)ICBO=2.45+0.2=2.65Ma

IE=IC+IB=2.65+0.05=2.7mA.

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