Please help?
A U shaped wire is dipped in soap solution and removed. The thin soap film formed between the wire and the light slider supports a weight of #1.5 xx 10^(-2) N# {including the weight of the slider}. The length of the slider is 30 cm. Find the surface tension of the soap solution?
A U shaped wire is dipped in soap solution and removed. The thin soap film formed between the wire and the light slider supports a weight of
1 Answer
Mar 7, 2018
Surface tension
The soap film formed on the U shaped wire has two sides, each of which contributes equally to the force.
Total weight supported by the soap film
The length of the slider is
Total force due to surface tension
Equating the two we get
#0.6gamma=1.5xx10^-2#
#=>gamma=(1.5xx10^-2)/0.6=2.5xx10^-2\ Nm^-1#