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).

विकल्प

• 8 TL

• 2 TL

• R = `("R"_1^3 + "R"_2^3)^(1//3)`

• 12 TL

Answer 1

A square frame of each side L is dipped in a soap solution and taken out. The force acting on the film formed is 8 TL.

Explanation:

The surface tension is given by

T = `"F"/"L"`

For soap film, force on single side of square frame,

F = 3TL   (film has two surfaces)

Hence, force on four sides of square frame,

F = 4(2T L) = 8T L