Semiconducting Devices Question 91
Question: In an NPN transistor the collector current is 24 mA. If 80% of electrons reach collector its base current in mA is
[Kerala PMT 2004]
Options:
A) 36
B) 26
C) 16
D) 6
Show Answer
Answer:
Correct Answer: D
Solution:
Given $ \ i _{c}=\frac{80}{100}\times i _{e} $
$ \Rightarrow 24=\frac{80}{100}\times i _{e} $
$ \Rightarrow i _{e}=30mA $ By using $ i _{e}=i _{b}+i _{c} $
Therefore ib = 30 - 24 = 6 mA.
