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  4. The surface tension of soap solution is 0.03 N/m. The amount of work done in forming a bubble of radius 5 cm is

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Q. The surface tension of soap solution is $0.03\, N/m$. The amount of work done in forming a bubble of radius $5\, cm$ is

Bihar CECEBihar CECE 2011Mechanical Properties of Fluids

Solution:

Work done $W=8 \pi R^{2} T$
$=8 \times 3.14\left(5 \times 10^{-2}\right)^{2} \times 0.03$
$=1.9 \times 10^{-3}\, J$