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A square frame of each side ' $\mathrm{L}$ ' is dipped in a soap solution and taken out. The force acting on the film formed is $(\mathrm{T}=$ surface tension of soap solution)
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8 TL
(B)
Length of four sides $=4 \mathrm{~L}$
$\therefore$ Force due to surface tension $=4 \mathrm{~L} \times 2 \mathrm{~T}=8 \mathrm{LT}$
Length of four sides $=4 \mathrm{~L}$
$\therefore$ Force due to surface tension $=4 \mathrm{~L} \times 2 \mathrm{~T}=8 \mathrm{LT}$
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