RE-NEET 2026 Physics Diodes MCQ Question
Three identical p-n junction diodes D₁, D₂ and D₃ are connected across a battery as shown in the figure. If the width of the depletion regions of D₁, D₂ and D₃ are W₁, W₂ and W₃, respectively, then the correct option is:
W₃ = W₁ > W₂
W₃ > W₂ > W₁
W₂ > W₁ = W₃
W₁ > W₂ > W₃
Correct Answer
Detailed Explanation
✅ Ans: B —
Quick Explanation: Diode biasing decides the current path. From the given circuit:
For a resistor:
Since and time are same:
Therefore,
🔴 A, C, D: Incorrect because they give a different order of work/current.
📖 NCERT Line
Forward bias: p-side connected to positive terminal and n-side to negative terminal → diode conducts.
Reverse bias: depletion region widens → very high resistance.
⚡ NEET QUICK REVISION
Diode → Check bias → Find current → → Compare W
🧠 Same R & time: More current = more work.
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