The two transistors in figure are identical. If β = 25,

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The two transistors in figure are identical. If β = 25, the current I^c2 is—

1. 28 µA
2. 23·2 µA
3. 26 µA
4. 24 µA

Correct Option: B

The given figure (i.e., fig)
From figure I_ref = 25 µA
Since both the transisors are identical
Therefore I_B1 = I_B2 = I_B & V_BE1 = V_BE2 = V_BE
Now, I_ref = I_B1 + I_C1 + I_B2 = I_B + βI_B + I_B = (β + 2) I_B

and I_C2 = βI_B2 = BI_B1 = βI_B =	β·I_ref
	(β + 2)

or I_C2 = 25·	25 µA	= 23·2 µA
	(25 + 2)

Hence alternative (B) is the correct choice.