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Friday, 9 October

JEE Main 2026 · PhysicsMultiple choiceSingle correctMediumConceptual

JEE Main 5 April 2026, Shift 2, Physics Q45

Question 45 of 75 in this shift, Physics question 20 of 25, Section A.

In a semiconductor p-n diode, the doping concentrations on p-side and n-side are 101510^{15} atoms/cm3^3 and 101810^{18} atoms/cm3^3, respectively. Which one of the following statements is true ?
  1. (1)Widths of depletion region on either side of the interface are equal
  2. (2)The depletion region width is more on p-side compared to that in n-sideOfficial answer
  3. (3)The depletion region width is more on n-side compared to that in p-side
  4. (4)No depletion region forms because of unequal doping concentrations on p and n-sides

Official answer

Option 2

NTA final key.

Chapter
Semiconductor Electronics: Materials, Devices and Simple Circuits
Topic
Semiconductor Diodes
Idea tested
Depletion Region Formation

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Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.