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JEE Main 2021 (22 Jul, Shift 2) · Special Purpose Diodes

Special Purpose Diodes question from JEE Main 2021 (22 Jul, Shift 2)

Q68JEE Main 2021 · 22 JUL · SHIFT 2Medium

Special Purpose Diodes

In a given circuit diagram, a 5 V zener diode along with a series resistance is connected across a 50 V power supply. The minimum value of the resistance required, if the maximum zener current is 90 mA will be __________ $\Omega$ .

Numerical answer type. Work it out, then open the answer.

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Answer: 500

$R$ is smallest when the current through it equals the maximum Zener current $90$ mA.
Drop across $R$ : $50 - 5 = 45$ V
$R_{min} = \frac{45}{0.09} = 500\ \Omega$

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