The surface tension of a liquid is 5 , N/m. I | vedclass

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(C) The surface energy $U$ of a liquid film is given by the formula $U = T 	imes \Delta A_{total}$.Since a thin film formed on a loop has two free su

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$2 	imes 10^{-1} \, J$

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(C) The surface energy $U$ of a liquid film is given by the formula $U = T 	imes \Delta A_{total}$.Since a thin film formed on a loop has two free surfaces (one on each side),the total surface area $\Delta A_{total}$ is twice the area of the film.Given: Surface tension $T = 5 \, N/m$ and area of one side $A = 0.02 \, m^2$.Total surface area $\Delta A_{total} = 2 	imes A = 2 	imes 0.02 = 0.04 \, m^2$.Therefore,surface energy $U = 5 	imes 0.04 = 0.2 \, J$.This can be written as $2 	imes 10^{-1} \, J$.

The surface tension of a liquid is $5 \, N/m$. If a thin film of the area $0.02 \, m^2$ is formed on a loop,then its surface energy will be

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