Electronic Devices Question 21

Question: Consider an NPN transistor amplifier in common-emitter configuration. The current gain of the transistor is 100. If the collector current changes by 1 mA, what will be the change in emitter current

[AIIMS 2005]

Options:

A) 1.1 mA

B) 1.01 mA

C) 0.01 mA

D) 10 mA

Show Answer

Answer:

Correct Answer: B

Solution:

Current gain β=ΔicΔib
Δib=1×103100=105A =0.01mA.

By using Δie=Δib+Δic
Δie = 1.01 + 1 = 1.01mA.



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