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Saturday, 31 October

JEE Main 2020 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 3 September 2020, Shift 1, Physics Q10

Question 10 of 75 in this shift, Physics question 10 of 25.

Two isolated conducting spheres S1_1 and S2_2 of radius 23\frac{2}{3}R and 13\frac{1}{3}R have 12 μ\muC and −3-3 μ\muC charges, respectively, and are at a large distance from each other. They are now connected by a conducting wire. A long time after this is done the charges on S1_1 and S2_2 are respectively :
  1. (1)6 μ\muC and 3 μ\muCOfficial answer
  2. (2)3 μ\muC and 6 μ\muC
  3. (3)4.5 μ\muC on both
  4. (4)+4.5+4.5 μ\muC and −4.5-4.5 μ\muC

Official answer

Option 1

NTA final key (Sep 2020).

Chapter
Electrostatic Potential and Capacitance
Topic
Conductors in Fields
Idea tested
Charge Ratio of Connected Distant Spheres

Same idea in other shifts

Asked 2× in all
  1. 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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.