The input resistance of a silicon transistor is 100 . Base current is changed by 40 μA which results in a change in collector current by 2 mA. This transistor is used as a common‐emitter amplifier wi…

Question

The input resistance of a silicon transistor is 100 . Base current is changed by 40 μA which results in a change in collector current by 2 mA. This transistor is used as a common‐emitter amplifier with a load resistance of4 kΩ . The voltage gain of the amplifier is [2012]

Accepted Answer

Correct answer: A. (a) Here, Input resistance, R_i=100 Change in base current, I_B=40 A Change in collector current, I_C=2 mA Load resistance, R_L=4 kΩ=4 10^3 Current gain, = I_C I_B= 2 mA40 A = 2 10^-3 A40 10^-6 A=50 Voltage gain of the amplifier is A_V= R_LR_i=50 4 10^3100=2000

$The input resistance of a silicon transistor is 100Ω . Base current is changed by 40 μA which results in a change in collector current by 2 mA . This transistor is used as a common‐emitter amplifier with a load resistance of4 kΩ . The voltage gain of the amplifier is [2012]$

Solution

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