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Why is there a difference in the resistors connected to the zener diode ?

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While studying the V-I characteristics of a zener diode, there are two different values of resistors connected in series with it. In case of the forward characteristics, a ~70 ohm resistor is connected whereas in case of reverse characteristics, a fairly large ~510 ohm resistor. What is the reason behind it ? Is the difference really necessary ?image

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