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A common emitter amplifier circuit, built using an npn transistor, is shown in the figure. Its dc current gain is 250, R C = 1 k Ω and V CC = 10V.What is the minimum base current for V CE to reach saturation ? R B R C V CC V B

1. 10 μ A
2. 100 μ A
3. 40 μ A
4. 7 μ A

Correct answer: 40 μ A

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