A Zener diode is connected to a battery and a load as show below: The currents, I,IZ and IL are respectively.

Here, R=4kΩ=4×103Ω​Vi=60 V​ Zener voltage Vz=10 V​RL=2kΩ=2×103Ω​ Load current, IL=VZRL=102×103=5 mA​ Current through R,I=Vi−VZR​=60−104×103=504×103=12.5 mA​ Fom circuit diagram, ​I=IZ+IL​⇒12.5=IZ+5​⇒ IZ=12.5−5=7.5 mA