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  • A transistor is operated in common emitter configuration at <img alt="\mathrm{\mathrm{V}_{\mathrm{C}}=2 \mathrm{~V}}" src="https://entrancecorner.oncodecogs.com/gif.latex?%5Cmathrm%7B%5Cmathrm

A transistor is operated in common emitter configuration at \mathrm{\mathrm{V}_{\mathrm{C}}=2 \mathrm{~V}} such that a change in the base current from 

\mathrm{100 \mu \mathrm{A} \text { to } 300 \mu \mathrm{A}} produces a change in the collector current from 10 mA to 20 mA. The current gain is:

Option: 1

50


Option: 2

75


Option: 3

100


Option: 4

25


Answers (1)

best_answer

Current gain in common emitter transistor is

\mathrm{\beta=\frac{\Delta \mathrm{I}_{\mathrm{C}}}{\Delta \mathrm{I}_{\mathrm{B}}}=\frac{(20-10) \mathrm{mA}}{(300-100) \mu \mathrm{A}}=\frac{10 \times 10^{-3} \mathrm{~A}}{200 \times 10^{-6} \mathrm{~A}}=50}

Posted by

shivangi.bhatnagar

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