A transistor is used as a common emitter amplifier with a load resistance 2 k Ω . The input resistance is 150Ω , Base current is changed by 20 μ A which results in a change in collector current by 1.5

Question

A transistor is used as a common emitter amplifier with a load resistance 2 k Ω . The input resistance is 150Ω , Base current is changed by 20 μ A which results in a change in collector current by 1.5 mA . The voltage gain of the amplifier is

TestHub · Accepted Answer

The correct option is (B). Concept: The voltage gain is given by β = I B ​ I C ​ ​ = 20 μ A 1.5 mA ​ = 75 And the voltage gain can be written as, V i ​ V 0 ​ ​ = β R i ​ R L ​ ​ = 75 × 150 2000 ​ = 1000

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