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JEE Main 2021 (26 Feb, Shift 2) · Special Purpose Diodes

Special Purpose Diodes question from JEE Main 2021 (26 Feb, Shift 2)

Q71JEE Main 2021 · 26 FEB · SHIFT 2Medium

Special Purpose Diodes

The zener diode has a Vz = 30V. The current passing through the diode for the following circuit is ________ mA.

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

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Answer: 9

Without the Zener the load gets $90 \times \frac{5}{9} = 50$ V $> 30$ V, so the Zener holds $30$ V.
$I = \frac{90 - 30}{4\text{ k}\Omega} = 15$ mA
$I_L = \frac{30}{5\text{ k}\Omega} = 6$ mA
$I_Z = 15 - 6 = 9$ mA

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