(a) Assuming the current drawn by RE in Fig. P4.10 splits equally between the two BJTs, fi nd Ri , Ro, and voyvi if 0 5 200, VA 5 50 V, and VBE(on) 5 0.7 V. Hint: recall that for ac purposes Q2 acts...

(a) Assuming the current drawn by RE in Fig. P4.10 splits equally between the two BJTs, fi nd Ri , Ro, and voyvi if 0 5 200, VA 5 50 V, and VBE(on) 5 0.7 V. Hint: recall that for ac purposes Q2 acts as a diode with ac resistance re. (b) What function does Q2 serve in this circuit? What happens if we remove Q2 altogether from the circuit?