(C) The surface energy $U$ of a liquid film is given by the formula: $U = T \times A \times n$,where $T$ is the surface tension,$A$ is the area of one

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(C) The surface energy $U$ of a liquid film is given by the formula: $U = T \times A \times n$,where $T$ is the surface tension,$A$ is the area of one side of the film,and $n$ is the number of free surfaces.For a film held on a ring,there are two free surfaces (one on each side of the film),so $n = 2$.Given: $T = 5 \,N/m$ and $A = 0.02 \,m^2$.Substituting the values: $U = 5 \times 0.02 \times 2$.$U = 0.1 \times 2 = 0.2 \,J$.$U = 2 \times 10^{-1} \,J$.

Class 11 Physics Fluid Mechanics and Surface Tension Surface Energy

Easy

The surface tension of a liquid is $5 \,N/m$. If a film is held on a ring of area $0.02 \,m^2$,its surface energy is about ........... $J$.

A
$5 \times 10^{-2}$
B
$2.5 \times 10^{-2}$
C
$2 \times 10^{-1}$
D
$3 \times 10^{-1}$

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The surface tension of a liquid is $5 \,N/m$. If a film is held on a ring of area $0.02 \,m^2$,its surface energy is about ........... $J$.

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