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  • The current gain of a transistor in the common base mode is 0.9. If the change in the emitter current is 5 mA, the change in the collector current will beOption:

The current gain of a transistor in the common base mode is 0.9. If the change in the emitter current is 5 mA, the change in the collector current will be

Option: 1

4 mA


Option: 2

4.5 mA


Option: 3

5.6 mA


Option: 4

Zero


Answers (1)

best_answer

\mathrm{\begin{aligned} & \text { Current gain }=\frac{\text { small change in collector current }\left(\Delta \mathrm{i}_{\mathrm{c}}\right)}{\text { small change in emitter current }\left(\Delta \mathrm{i}_{\mathrm{c}}\right)} \\ & 0.9=\frac{\Delta \mathrm{i}_{\mathrm{c}}}{5} \\ & \Rightarrow \Delta \mathrm{i}_{\mathrm{c}}=0.9 \times 5=4.5 \mathrm{~mA} \end{aligned} }

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