Question

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

• A. 2000
• B. 3000
• C. 4000
• D. 1000

Answer 1

The correct option is A 2000

$V_g=\beta \frac{R_L}{R_I}=\frac{\Delta I_C}{\Delta I_B}\frac{R_L}{R_I}\left(Since,\beta =\frac{\Delta I_C}{\Delta I_B}\right)Puttingvalues{V}_g=\frac{2\times {10}^{-3}}{40\times {10}^{-6}}\times \frac{4\times {10}^3}{100}{V}_g=2000$