Question

For an n-p-n transistor circuit, the collector current is 10mA. If 90% of the electron emitted reach the collector then

• A. the base current will be 1 mA
• B. the base current will be 10 mA
• C. the emitter current will be 11 mA
• D. the emitter current will be 9 mA

Answer 1

The correct option is A the base current will be 1 mA

Given that for $n-p-n$ transistor , the collector current $I_c=10mA$

Given that $90$% electrons emitted reaches collector.

So we get $I_e=\frac{9}{10}{I}_c=9\times \frac{10}{10}=9mA$

The base current $I_b=I_c-I_e=10-9=1mA$

Therefore the correct option is $A$