Скачать или смотреть JEE Mains 2025 Physics | Buoyancy & Torque Balance Trick Question | 8th April Shift 2 Solution

In this video, we solve a unique JEE Mains 2025 Physics question from the 8th April Shift 2 paper involving a cube with unknown mass, torque balance, and the principle of buoyancy.

🔍 Question Summary:
A 10 cm side cube with unknown mass and a 200 gm mass are suspended at two ends of a 27 cm long rod. The rod is placed on a wedge such that the wedge is 25 cm from the 200 gm side. Initially, the system is unbalanced. As water is added under the cube, it eventually becomes balanced when half the cube is submerged in water.

📘 Concepts Involved:

Torque and rotational equilibrium

Buoyant force (Archimedes’ Principle)

Balancing moments about the pivot

Density and volume relationships

🧠 Final Answer:
Using torque balance and the buoyant force acting on the cube when half submerged, the unknown mass is calculated to be 800 grams.

📢 Watch till the end to understand how combining concepts from rotational mechanics and fluid mechanics can help you crack complex problems in seconds!

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