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Friday, 9 October

JEE Main 2025 · PhysicsMultiple choiceSingle correctMediumApplication

JEE Main 2 April 2025, Shift 1, Physics Q30

Question 30 of 75 in this shift, Physics question 5 of 25, Section A.

A square Lamina OABC of length 10 cm is pivoted at 'O'. Forces act at Lamina as shown in figure. If Lamina remains stationary, then the magnitude of F is :

The figure, in words

Square lamina OABC of side 10 cm with O at bottom-left (pivot), A bottom-right, B top-right, C top-left. Forces: at C, 10 N upward and F directed to the left; at B, 10 N upward and 10 N to the right; at A, 10 N to the right and 10 N downward.
  1. (1)0 (zero)
  2. (2)20 N
  3. (3)10 NOfficial answer
  4. (4)10210\sqrt{2} N

Official answer

Option 3

NTA final key.

Chapter
System of Particles and Rotational Motion
Topic
Torque and Equilibrium
Idea tested
Torque about an Axis

Same idea in other shifts

Asked 2× in all
  1. 2 Apr 2017 (offline) · Q6A slender uniform rod of mass M and length ll is pivoted at one end so that it can rotate in a vertical plane (see figure). There is…MediumSingle correctHas 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.