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Saturday, 31 October

JEE Main 2022 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 27 June 2022, Shift 1, Physics Q34

Question 34 of 90 in this shift, Physics question 4 of 30, Section A.

A system of two blocks of masses m=2m=2 kg and M=8M=8 kg is placed on a smooth table as shown in figure. The coefficient of static friction between two blocks is 0.5. The maximum horizontal force F that can be applied to the block of mass M so that the blocks move together will be :

The figure, in words

Block of mass m sits on top of a larger block of mass M, which rests on a table drawn as a hatched horizontal surface; a horizontal arrow F points to the right, applied at the right side of block M.
  1. (1)9.89.8 N
  2. (2)39.239.2 N
  3. (3)4949 NOfficial answer
  4. (4)78.478.4 N

Official answer

Option 3

NTA final key.

Chapter
Laws of Motion
Topic
Friction
Idea tested
Two-Block Friction Systems

Same idea in other shifts

Asked 3× in all
  1. 26 Aug 2021, Shift 2 · Q21The coefficient of static friction between two blocks is 0.5 and the table is smooth. The maximum horizontal force that can be applied to…MediumNumerical valueHas a figure
  2. 17 Mar 2021, Shift 1 · Q30Two blocks (m = 0.5 kg and M = 4.5 kg) are arranged on a horizontal frictionless table as shown in figure. The coefficient of static…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 108 of the 174 JEE Main shifts held from 2017 to 2026.