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(B) soap film has two surfaces: one on the front and one on the back.When a square frame of side $L$ is dipped in a soap solution, a film is formed ac

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(B) soap film has two surfaces: one on the front and one on the back.When a square frame of side $L$ is dipped in a soap solution, a film is formed across the frame.The total length of the boundary of the film that is in contact with the frame is $4L$ for one side.Since the soap film has two surfaces, the total length of the film in contact with the frame is $2 	imes 4L = 8L$.The force $F$ due to surface tension $T$ is given by the formula $F = T 	imes (	ext{total length of contact})$.Therefore, $F = T 	imes 8L = 8TL$.

$A$ square frame of each side $L$ is dipped in a soap solution and taken out. The force acting on the film formed is ($T$ = surface tension of soap solution). (in $TL$)

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