In the figure shown, the maximum and minimum currents through Zener diode are

As 10 kilo ohm is in parallel with Zener then voltage and current across it is constant and the current through the load is 4010×103=4 mAMinimum potential drop across 5 kilo ohm resistor is 70 - 40 = 30 V and current is 305×103=6 mAcurrent through Zener is 6 - 4 = 2 mAmaximum voltage drop across the 5 Kilo ohm resistor is 110 - 40 = 70 Vmaximum current 705×103=14 mA maximum current through Zener 14-4=10 mA