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In the circuit given, the two Si transistors are similar. Given β=50, Vcc=12V, I1=5mA. Find I?

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In the circuit given, the two Si transistors are similar. Given β=50, Vcc=12V, I1=5mA. Find I?

(a) 5 mA

(b) 4.807 mA

(c) 4.5 mA

(d) 5.2 mA

I got this question in exam.

Asked question is from Transistor Bias Configuration topic in portion Transistor Biasing and Low Frequencies of Analog Circuits

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Correct choice is (b) 4.807 mA

Best explanation: The circuit is a current mirror circuit. Both transistors are similar. I1= IREF = 5 mA

Β is not large so 2/β is not negligible.

Thus current I = I1/(1 + 2/β) = 5mA/(1 + 2/50) = 4.807 mA.

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