(a) In the circuit of Fig. P1.8 fi nd vO for the following cases: vI 5 0 V, vI 5 63 V, and vI 5 66 V. (b) Repeat part (a) if R3 is changed to 30 kV. (c) Repeat part (a) if R1 is changed to 30 kV. (d)...

(a) In the circuit of Fig. P1.8 fi nd vO for the following cases: vI 5 0 V, vI 5 63 V, and vI 5 66 V. (b) Repeat part (a) if R3 is changed to 30 kV. (c) Repeat part (a) if R1 is changed to 30 kV. (d) Repeat part (a) if R2 is removed from the circuit.