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Saturday, 31 October

JEE Main 2020 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 3 September 2020, Shift 2, Physics Q11

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

Concentric metallic hollow spheres of radii R and 4R hold charges Q1Q_1 and Q2Q_2 respectively. Given that surface charge densities of the concentric spheres are equal, the potential difference V(R)−V(4R)V(R) - V(4R) is :
  1. (1)3Q14πε0R\frac{3Q_1}{4\pi\varepsilon_0 R}
  2. (2)3Q116πε0R\frac{3Q_1}{16\pi\varepsilon_0 R}Official answer
  3. (3)3Q24πε0R\frac{3Q_2}{4\pi\varepsilon_0 R}
  4. (4)Q24πε0R\frac{Q_2}{4\pi\varepsilon_0 R}

Official answer

Option 2

NTA final key (Sep 2020).

Same idea in other shifts

Asked 2× in all
  1. 2 Sep 2020, Shift 2 · Q10A charge Q is distributed over two concentric conducting thin spherical shells radii r and R (R > r). If the surface charge densities on…MediumDiagram basedHas a figure

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.