2019 Solution 06

what is the voltage Vz? If you landed on this quiz directly, please see 2019 Problem 05 to set the context.
The voltage at is approximately Vz = 15V*(1k/(10k+500+500)) = 1.36V.  This also means that the current in the 500Ω load is 1.36mA. The closest choice for Problem 12 was therefore 1mA. 
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This problem was taken from Horowitz and Hill, "The Art of Electronics"; and highlights the fact that when resistors form a chain between two defined voltages, the intermediate net voltages are determined by the resistors.
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