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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

(a) `0.0125Nm^-1`

B

(b) `0.1Nm^-1`

C

(c) `0.05Nm^-1`

D

(d) `0.025Nm^-1`

Text Solution

Verified by Experts

The correct Answer is:
D
At equilibrium,
`2Tl=mg`
`T=(mg)/(2l)=(1.5xx10^-2)/(2xx30xx10^-2)=1.5/60=0.025N//m=0.025Nm`
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