Question

A square wire frame of size L is dipped in a liquid. On taking out, a membrane is formed. If the surface tension of liquid is T, then force acting per unit length of the frame is VA) 2T (B) 4T (C) 8T (D) T
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Answer 1

Answer:

A perimeter of the square is 4L, on one side. So including both side, total length will be 8L.

The force, if T is surface tension (for per unit length) will be 8LT.

Explanation:

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Answer 2

Answer:

• Option A = 2T

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