A soap film is formed on a rectangular f...

A soap film is formed on a rectangular frame of length 7 cm dipping in soap solution. The frame hanges from the arm of a balance. An extra weight of 0.38 g is to be placed in the opposite pan to balance the pull on the frame. Calculate the surface tension of the soap solution. `"Given" g= 980 "cms"^(-2).`

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The correct Answer is:

`(26.6"dyne" cm^(-1))`

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