Question

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)

• A. \(4\,TL\)
• B. \(8\,TL\)
• C. \(12\,TL\)
• D. \(16\,TL\)

Hint:

A soap film has two surfaces, so force = 2 x T x total length of the frame.

Answer 1

The Correct Option is B

Step 1: Surfaces
Two surfaces, each pulling along a total length of $4L$.

Step 2: Force
$F = 2 \times T \times 4L$.

Step 3: Answer
$8TL$, option (B).

Final Answer:
Option (B). \[ \boxed{8TL} \]