Question

In a npn transistor circuit, the collector current is 10 mA. If 95 per cent of the electrons emitted reach the collector, which of the following statements are true?

1. The emitter current will be 8 mA.
2. The emitter current will be 10.53 mA.
3. The base current will be 0.53 mA.
4. The base current will be 2 mA.

Options

• a and c

• a, c and d

• b and c

• b, c and d

Answer 1

b and c

Explanation:

According to the problem, the collector current is 95% of electrons reaching the collector after emission. And collector current, I_C = 10 mA

I_E = Emitter current

Also, `I_C = 95/100 I_E`

⇒ `I_E = (10 xx 100)/95` = 10.53 mA

Also, `I_B = I_E - I_C` = 10.53 – 10 = 0.53 mA