The perfectly matched silicon transistors are connected

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The perfectly matched silicon transistors are connected as shown in figure below. The value of current I will be—

1. 0 mA
2. 2·3 mA
3. 4·3 mA
4. 7·3 mA

Correct Option: C

The given circuit

Given, β = 1000 for each transistor, V_BE = 0·7 V, and both the transistors are perfectly matched.
From figure I ≈ current flowing through 1 kΩ resistance.
Applying KVL to the 1 kΩ resistance loop, we get
– 1 kΩ. I – V_BE + 5 = 0

or I =	4·3V	= 4·3 mA
	1 kΩ

Hence alternative (C) is the correct choice.