In the circuit below, the zener diode has Vz=Vzo=5V, rz =0 Ohms,Izmin =0. When the diode is forward biased, the constant voltagedrop (Vd = .7V) model applies.
For the following three values of Vin, find the operatingregion of the diode: on (forward biased), off (reverse biased) ofZener breakdown, and solve the circuit to find I2, I1 and V1.

a) Vin = -4V

b)Vin = 5V

c) Vin = 14V


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