A Zener shunt regulator employs a 9.1V Zener diode for which Vz=9.1V at Iz=9mA, with rz=40Ω. The available supply voltage of 15V can vary as much as ±10%. plusminus 10%. For this diode, what is the value of Vzv For a nominal load resistance RL of 1 k Ohm and a nominal zener current of 10 mA, what current must flow in the supply resistor R? For the nominal value of supply voltage, select a value for resistor R, specified to one significant digit, to provide at least that current. What nominal output voltage results? For a plusminus 10% change in the supply voltage, what variation in output voltage results? If the load current is reduced by 50%, what increase in V0 results? What is the smallest value of load resistance that can be tolerated while maintaining regulation when the supply voltage is low? What is the lowest possible output voltage that results? Calculate values for the line regulation and for the load regulation for this circuit using the numerical results obtained in this problem.