Answer to Question 3

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(a) V = 12 - 5 = 7 V

(b) I = V/R = 7 1000 = 7 10-3 A = 7 mA

(c) Voltage across 400 k resistor = 12 - 0.5 = 11.5 V;

      I be = 11.5 400 000 = 2.875 10-6 A = 28.8 mA

(d) Gain = 7 10-3 2.875 10-6 = 240