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Saturday, 31 October

JEE Main 2022 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 29 July 2022, Shift 2, Physics Q31

Question 31 of 90 in this shift, Physics question 1 of 30, Section A.

Two identical metallic spheres A and B when placed at certain distance in air repel each other with a force of F. Another identical uncharged sphere C is first placed in contact with A and then in contact with B and finally placed at midpoint between spheres A and B. The force experienced by sphere C will be:
  1. (1)3F/2
  2. (2)3F/4Official answer
  3. (3)F
  4. (4)2F

Official answer

Option 2

NTA final key.

Chapter
Electric Charges and Fields
Topic
Coulomb's Law
Idea tested
Charge Redistribution via Conduction

Same idea in other shifts

Asked 3× in all
  1. 6 Apr 2024, Shift 2 · Q42Two identical conducting spheres PP and SS with charge QQ on each, repel each other with a force 16 N. A third identical uncharged…MediumSingle correct
  2. 25 Feb 2021, Shift 2 · Q27Two identical conducting spheres with negligible volume have 2.1 nC and −-0.1 nC charges, respectively. They are brought into contact and…EasyNumerical value

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 108 of the 174 JEE Main shifts held from 2017 to 2026.