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Question: In an NPN transistor the collector current is 24 mA. If 80% of electrons reach collector its base cu...

In an NPN transistor the collector current is 24 mA. If 80% of electrons reach collector its base current in mA is

A

36

B

26

C

16

D

6

Answer

6

Explanation

Solution

Given

6muic=80100×ie24=80100×ieie=30mA\mspace{6mu} i_{c} = \frac{80}{100} \times i_{e} \Rightarrow 24 = \frac{80}{100} \times i_{e} \Rightarrow i_{e} = 30mA

By using ie=ib+ici_{e} = i_{b} + i_{c} ⇒ ib = 30 – 24 = 6 mA.