For the Zener diode shown in the figure, the Zener voltage

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For the Zener diode shown in the figure, the Zener voltage at knee is 7 V, the knee current is negligible and the Zener dynamic resistance is 10 Ω. If the input voltage (V_i) range is from 10 to 16 V, the output voltage (V₀) ranges from—

1. 7·00 to 7·29 V
2. 7·14 to 7·29 V
3. 7·14 to 7·43 V
4. 7·29 to 7·43 V

Correct Option: C

The given figure (i.e., fig - 1)
Given, V_Z = 7V, r_Z = 10Ω
V_i range 10 to 16 V
V₀ range =?
The given circuit can be modified as shown below (i.e., fig - 2)
When, V_i = 10V i.e., V_i(min)

Then, I =		10 – 7	=	3	A
		210		210

and V_0(min) = I × 10 + V_Z

=	3	× 10 + 7 = 7·14V
	210

When, V_i = 16V i.e., V_i(max)

Then, I =		16 – 7	=	9	A
		210		210

and V_0(max) = I × 10 + VZ =	9	× 10 + 7
	210

= 7·428 ≈ 7·43V
Hence alternative (C) is the correct choice.