An air bubble of radius 0.1 cm lies at a depth of 20 cm below the free surface of a liquid of density

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🧑‍🏫 Author: Aditya Bhatt Sir   |   🕒 Last Updated: July 13, 2025

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📘Question

An air bubble of radius 0.1 cm lies at a depth of 20 cm below the free surface of a liquid of density 1000 kg/m^3. If the pressure inside the bubble is 2100 N/m^2 greater than the atmospheric pressure, then the surface tension of the liquid in SI unit is (use g = 10 m/s^2)

(1) 0.02

(2) 0.1

(3) 0.25 

(4) 0.05          (JEE-2025)

✅ Answer

An air bubble of radius 0.1 cm lies at a depth of 20 cm below the free surface of a liquid of density 1000 kg/m^3. If the pressure inside the bubble is 2100 N/m^2 greater than the atmospheric pressure, then the surface tension of the liquid in SI unit is (use g = 10 m/s^2) (1) 0.02 (2) 0.1 (3) 0.25  (4) 0.05 

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