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Friday, 9 October

JEE Main 2020 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 8 January 2020, Shift 1, Physics Q3

Question 3 of 75 in this shift, Physics question 3 of 25, Section A.

The coordinates of centre of mass of a uniform flag shaped lamina (thin flat plate) of mass 4 kg. (The coordinates of the same are shown in figure) are :

The figure, in words

L-shaped (flag) lamina with vertices (0,0), (1,0), (1,2), (2,2), (2,3), (0,3).
  1. (1)(0.75 m, 1.75 m)Official answer
  2. (2)(0.75 m, 0.75 m)
  3. (3)(1 m, 1.75 m)
  4. (4)(1.25 m, 1.50 m)

Official answer

Option 1

NTA final key (Jan 2020).

Chapter
System of Particles and Rotational Motion
Topic
Center of Mass
Idea tested
COM of Composite Bodies

Same idea in other shifts

Asked 2× in all
  1. 8 Apr 2024, Shift 1 · Q52A uniform thin metal plate of mass 10 kg with dimensions is shown. The ratio of xx and yy coordinates of center of mass of plate in…MediumNumerical valueHas 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. 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.