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A thin liquid film formed between a U-sh...

A thin liquid film formed between a U-shaped wire and a light slider supports a weight of `1.5xx10^-2N` (see figure). The length of the slider is 30cm and its weight negligible. The surface tension of the liquid film is

A

0.1 N/m

B

0.05 N/m

C

0.025 N/m

D

0.0125 N/m

Text Solution

Verified by Experts

The correct Answer is:
C
According to the given figure, the force due of the surface tension will balance the weight.

`impliesF=w`
or `2TL=w`
or `T=w/(2L)`
Substituting the given values we get
`T=(1.5xx10^(-2)N)/(2xx30xx10^(-2)m)=0.025N//m`
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