B=49, IVbel=0.8 V, 1-2 mA, V1=15.18 V, V3= -11 V, R1=3 K, R2=3 K, R3=6 K. Calculate the critical V2 voltage to make second transistor ON. Write your answer as a volt and don't use unit in the answer. I T1 ww T2 R1 R3 V1 V3 ww V2 Vo R2