Physics · 2026
JEE Main · 23 January 2026, Shift 1 · Q45
The following diagram shows a Zener diode as a voltage regulator. The Zener diode is rated at V_z=5 V and the desired current in load is 5 mA. The…
The following diagram shows a Zener diode as a voltage regulator. The Zener diode is rated at $\displaystyle V_z=5 \mathrm{~V}$ and the desired current in load is $\displaystyle 5$ mA . The unregulated voltage source can supply upto $\displaystyle 25$ V . Considering the Zener diode can withstand four times of the load current, the value of resistor $\displaystyle R_s$ (shown in circuit) should be $\displaystyle \_\_\_\_$ $\displaystyle \Omega$.
Official answer
From NTA’s final answer key for this paper.
No correct option: NTA dropped this question in its final answer key.
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JEE Main 2026 Physics question, with the answer from NTA’s final answer key. Where our answers come from.