Physics · 2025
JEE Main · 2 April 2025, Shift 1 · Q45
A zener diode with 5 V zener voltage is used to regulate an unregulated dc voltage input of 25 V. For a 400 Ω resistor connected in series, the zener…
A zener diode with $\displaystyle 5$ V zener voltage is used to regulate an unregulated dc voltage input of $\displaystyle 25$ V . For a $\displaystyle 400 \Omega$ resistor connected in series, the zener current is found to be $\displaystyle 4$ times load current. The load current $\displaystyle \left(\mathrm{I}_{\mathrm{L}}\right)$ and load resistance $\displaystyle \left(\mathrm{R}_{\mathrm{L}}\right)$ are :
Official answer
From NTA’s final answer key for this paper.
(3)
$\displaystyle \mathrm{I}_{\mathrm{L}}=10 \mathrm{~mA} ; \mathrm{R}_{\mathrm{L}}=500 \Omega$
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JEE Main 2025 Physics question, with the answer from NTA’s final answer key. Where our answers come from.