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V-I Characteristics for a P-N Junction Diode

In an npn tra...

Question

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

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Solution

The correct option is B
6

We know that, Ie = Ic + Ib
Given 80% of I_e = Ic = 24 mA

(80/100) I_e=24mA

I_e= (24×100)/80

I_e = 30 mA

I_b = Ie - Ic

= (30 - 24) mA
= 6 mA

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