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Friday, 9 October

JEE Main 2020 · PhysicsMultiple choiceSingle correctEasyConceptual

JEE Main 6 September 2020, Shift 2, Physics Q11

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

Consider the force F on a charge 'q' due to a uniformly charged spherical shell of radius R carrying charge Q distributed uniformly over it. Which one of the following statements is true for F, if 'q' is placed at distance r from the centre of the shell ?
  1. (1)F=14πϵ0Qqr2F=\frac{1}{4\pi\epsilon_0}\frac{Qq}{r^2} for all r
  2. (2)F=14πϵ0QqR2F=\frac{1}{4\pi\epsilon_0}\frac{Qq}{R^2} for r<Rr<R
  3. (3)F=14πϵ0Qqr2F=\frac{1}{4\pi\epsilon_0}\frac{Qq}{r^2} for r>Rr>ROfficial answer
  4. (4)14πϵ0qQR2>F>0\frac{1}{4\pi\epsilon_0}\frac{qQ}{R^2}>F>0 for r<Rr<R

Official answer

Option 3

NTA final key (Sep 2020).

Chapter
Electric Charges and Fields
Topic
Electric Field
Idea tested
Field of a Spherical Shell

Same topic in other shifts

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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.