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Friday, 9 October

JEE Main 2025 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 8 April 2025, Shift 2, Physics Q36

Question 36 of 75 in this shift, Physics question 11 of 25, Section A.

An infinitely long wire has uniform linear charge density λ=2\lambda = 2 nC/m. The net flux through a Gaussian cube of side length 3\sqrt{3} cm, if the wire passes through any two corners of the cube, that are maximally displaced from each other, would be x Nm2C−1x\ \mathrm{Nm^2C^{-1}}, where xx is: [Neglect any edge effects and use 14πϵ0=9×109\frac{1}{4\pi\epsilon_0} = 9 \times 10^9 SI units]
  1. (1)0.72 π0.72\,\pi
  2. (2)6.48 π6.48\,\pi
  3. (3)[illegible]
  4. (4)2.16 π2.16\,\piOfficial answer

Official answer

Option 4

NTA final key.

Chapter
Electric Charges and Fields
Topic
Gauss's Law
Idea tested
Gauss Law Application

Same idea in other shifts

Asked 4× in all
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  2. 29 Jan 2024, Shift 1 · Q40Two charges of 5Q5Q and −2Q-2Q are situated at the points (3a,0)(3a, 0) and (−5a,0)(-5a, 0) respectively. The electric flux through a sphere of…EasySingle correct
  3. 30 Jan 2024, Shift 2 · Q42Match List I with List II List I | List II A. Gauss's law of magnetostatics | I.…EasyMatch the list

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.