Semiconductor Electronics Materials Devices and Simple Circuits - Result Question 73
75. A transistor is operated in common emitter configuration at constant collector voltage $V_c=$ $1.5 V$ such that a change in the base current from $100 \mu A$ to $150 \mu A$ produces a change in the collector current from $5 mA$ to $10 mA$. The current gain $(\beta)$ is
[2006]
(a) 75
(b) 100
(c) 50
(d) 67
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Answer:
Correct Answer: 75. (b)
Solution:
$ \begin{aligned} & \text{ (b) } \Delta I_b=+50 \mu A, \Delta I_c=5 \times 10^{-3} A \\ & \beta=\frac{\Delta I_c}{\Delta I_b}=\frac{5 \times 10^{-3}}{50 \times 10^{-6}}=\frac{5 \times 1000}{50}=100 \end{aligned} $
