Question

A U-shaped wire is dipped in a soap solution, and removed. A thin soap film formed between the wire and a light slider supports a weight of `1.5xx10^(-2)N` (which includes the small weigh of the slider). The length of the slider is 30cm. What is the surface tension of the film?
A. `0.025`N/m
B. `0.050`N/m
C. `0.5`N/m
D. `0.250`N/m

Answer 1

Correct Answer - A
`T = F/(2l) = (1.5xx10^(-2))/(2xx30xx10^(-2))= 0.025` N/m