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The input resistance of a silicon transistor is 100 W. Base current is changed by \mathrm{40\mu A} which results in a change in collector current by 2 mA. This transistor is used as a common emitter amplifier with a load resistance of \mathrm{4k\Omega } . The voltage gain of the amplifier is

Option: 1

2000


Option: 2

3000


Option: 3

4000


Option: 4

1000


Answers (1)

\mathrm{\begin{aligned} & \text { Voltage gain }\left(A_V\right)=\frac{V_{\text {out }}}{V_{\text {in }}}=\frac{I_{\text {out }}}{I_{\text {in }}} \times \frac{R_{\text {out }}}{R_{\text {in }}} \\ & A_V=\frac{2 \times 10^{-3}}{40 \times 10^{-6}} \times \frac{4 \times 10^3}{100}=2 \times 100=2000 \end{aligned}}

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Sumit Saini

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