Electronic Devices Question 291

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.



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