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Question 9 E5 (3 marks 5V 200? Qi 02 2000 142 Examine the circuit shown above. S? is a pushbutton switch, Li and La are LEDs with Vo.m 2V, and Q,and Q2 are transistors with ?-100 and Ver|-0.7 in saturation and forward active modes 9.1) (1.5 marks) Explain what this circuit does. 9.2) (1.5 marks) Calculate the current iuz through Lz when the switch St is open, and closed. 51 open 51 closed Page 18 of 23

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