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A 9.1-V zener diode exhibits its nominal voltage at a test current of 28 mA. At this current the incremental resistance is specified as 5 Ω. Find VZ0 of the Zener model.

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A 9.1-V zener diode exhibits its nominal voltage at a test current of 28 mA. At this current the incremental resistance is specified as 5 Ω. Find VZ0 of the Zener model.

(a) 8.96V

(b) 9.03V

(c) 9.17V

(d) 9.24V

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My question is from Zener Diode topic in chapter Diodes of Electronic Devices & Circuits

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Right answer is (b) 9.03V

Explanation: VZ = VZo + MZ IZT

9.1 = VZo + 5 * 28 * 10^-3

VZo = 8.96v

VZ = VZo + 5IZ = 8.96 * 5IZ.

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