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[" 40.There is small hole in a hollow sp...

[" 40.There is small hole in a hollow sphere.The water "],[" enters in it when it is taken to a depth of "40cm],[" under water.The surface tension of water is "],[0.07N/m" .The diameter of hole is "],[[" (1) "7mm," (2) "0.07mm],[" (3) "0.0007mm," (4) "0.7m]]

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