JEE Main 2022 · 29 Jul · Shift 2 · Physics Q58

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PhysicsInteger+4 / -1Question 58 of 90

A 8 V Zener diode along with a series resistance R is connected across a 20 V supply (as shown in the figure). If the maximum Zener current is 25 mA, then the minimum value of R will be _______ Ω.

A 20 V cell in series with resistance R feeding a Zener diode (reverse biased) connected in parallel with a load resistor R_L.

Your answer

Answer and worked solution

Official answer: 480

Worst case (no load current): all current through the Zener, $\dfrac{20-8}R\le25$ mA, so $R\ge480$ Ω.

Answer: 480

Topics:Special diodes (LED, Zener, photodiode, solar cell)

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JEE Main 2022 · 29 Jul · Shift 2, Physics question 58