Question

In an n-p-n transistor circuit, the collector current is 9 mA. If 90% of the electrons emitted reach the collector. Then the emitter current is

• A. 8.1 mA
• B. 8 mA
• C. 9 mA
• D. 10 mA

Answer 1

The correct option is D 10 mA

Given,

The collector current is $I_c=9mA$

Given that $90$% of electrons from emitter reaches collector.

So we have $I_c=\frac{9}{10}{I}_e$

$\Rightarrow I_e=\frac{10}{9}{I}_c=\frac{10}{9}\times 9=10mA$

Therefore option $D$ is correct.