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Well, any current up to the power dissipation rating of the diode. Most are rated something like a half watt or one watt. The current times the voltage drop has to remain below that rating.somebody please check the rules i have made-
drop across reverse biased zener- 5.3 (does it conduct)?(not leakage)
the voltage across zener is fixed whatever current flows through it in reverse bias and the current can increase to any value.