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In a transistor, the change in base current from \mathrm{100 \; \mu A} to \mathrm{125 \; \mu A} causes a change in collector current from 5 mA to 7.5 mA, keeping collector- to-emitter voltage constant at 10 V. What is the current gain of the transistor?

Option: 1

200


Option: 2

100


Option: 3

50


Option: 4

25


Answers (1)

best_answer

\mathrm{ \text { Current gain } \frac{\Delta \mathrm{I}_{\mathrm{C}}}{\Delta \mathrm{I}_{\mathrm{R}}} \text { when } \mathrm{V}_{\mathrm{CK}} \text { is constant. } }

\mathrm{ \begin{aligned} & =\frac{2.5 \times 10^{-3}}{25 \times 10^{-6}}=0.1 \times 10^3=100 \\ & {\left[\mathrm{~A}_{\mathrm{B}}=125 \mu \mathrm{A}-100 \mu \mathrm{A}=25 \mu \mathrm{A}, \Delta \mathrm{I}_{\mathrm{C}}=7.5 \mathrm{~mA}-5 \mathrm{~mA}=2.5 \mathrm{~mA}\right]} \end{aligned} }

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