Q. The input resistance of a silicon transistor is 100 Ω. 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 of 4 kΩ. The voltage gain of the amplifier is
A) 2000
B) 3000
C) 4000
D) 1000
Explanation
[Solution from source] Current gain β = ΔIc/ΔIb = 2 mA/40 µA = 50. Voltage gain = β × RL/Rin = 50 × 4000/100 = 2000. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.