3. (a) Consider the circuit shown below. The Zener Diode regulates at 50V over a range of diode current from 5 mA to 40 mA. Supply voltage V = 200V. Calculate the value of R to allow voltage regulation from a load current IL = 0 upto I max; the maximum possible value of IL. What is Imax? (Ans: Imax=35 mA) (b) If R is set as in part (a) and IL = 25mA, what are the limits between which V may vary without loss of regulation in the circuit? (Ans: Vmin=162.5 V, Vmax=293.8 V )