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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 tha n 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

Correct answer: 0.05

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