The typical output characteristics curve for a transistor working in the common-emitter configuration is shown in the figure.
The estimated current gain from the figure is ____
Answer: 200
Solution
Each curve in the saturated region is labelled by its base current, and the current gain is the ratio of the change in collector current to the change in base current that produced it. Moving from the IB=10μA curve to the IB=20μA curve raises the saturated collector current from 2 mA to 4 mA, and each further step of 10μA adds another 2 mA. Hence
β=ΔIBΔIC=10×10−62×10−3=200
The current gain estimated from the characteristics is 200.
JEE Main · 2021 · 18 Mar 2021 · Shift 2 · Integer answer
