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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 `1.5 xx 10^(-2)N`(see figure). The length of the slider is `30 cm` and its weight negligible. The surfaces tension of the liquid film is :

A

`0.0125Nm^(-1)`

B

`0.1Nm^(-1)`

C

`0.05Nm^(-1)`

D

`0.025Nm^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
D
2SL `= mg implies S =(mg)/(2L) =(1.5 xx10^(-2))/(0.6) = 2.5 xx10^(-2)N//m`
`implies 2.5 xx10^(-2) N//m implies S = 0.025 N//m`
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