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Friday, 9 October

JEE Main 2025 · PhysicsMultiple choiceOtherEasyConceptual

JEE Main 8 April 2025, Shift 2, Physics Q37

Question 37 of 75 in this shift, Physics question 12 of 25, Section A.

Electric charge is transferred to an irregular metallic disk as shown in figure. If σ1\sigma_1, σ2\sigma_2, σ3\sigma_3 and σ4\sigma_4 are charge densities at given points then, choose the correct answer from the options given below: A. σ1>σ3\sigma_1 > \sigma_3 ; σ2=σ4\sigma_2 = \sigma_4 B. σ1>σ2\sigma_1 > \sigma_2 ; σ3>σ4\sigma_3 > \sigma_4 C. σ1>σ3>σ2=σ4\sigma_1 > \sigma_3 > \sigma_2 = \sigma_4 D. σ1<σ3<σ2=σ4\sigma_1 < \sigma_3 < \sigma_2 = \sigma_4 E. σ1=σ2=σ3=σ4\sigma_1 = \sigma_2 = \sigma_3 = \sigma_4

The figure, in words

Irregular metallic disk, roughly circular with a pointed (sharply curved) top where σ1\sigma_1 is marked, a slightly pointed bottom for σ3\sigma_3, and nearly circular sides for σ4\sigma_4 (left) and σ2\sigma_2 (right); a dotted circle is drawn inside for reference.
  1. (1)D and E Only
  2. (2)B and C Only
  3. (3)A, B and C OnlyOfficial answer
  4. (4)A and C Only

Official answer

Option 3

NTA final key.

Chapter
Electrostatic Potential and Capacitance
Topic
Conductors in Fields
Idea tested
Action of Points and Corona Discharge

Same topic in other shifts

All Conductors in Fields questions
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  2. 4 Apr 2026, Shift 2 · Q38Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: In electrostatics, a…MediumAssertion–reason
  3. 7 Apr 2025, Shift 2 · Q38Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : The outer body…EasyAssertion–reason
  4. 8 Apr 2024, Shift 1 · Q45Two charged conducting spheres of radii aa and bb are connected to each other by a conducting wire. The ratio of charges of the two…EasySingle correct

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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.