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

`0.0125Nm^-1`

`0.1Nm^-1`

`0.05Nm^-1`

`0.025Nm^-1`

Text Solution

Verified by Experts

The correct Answer is:

Here, `W=1.5xx10^-2N`
`l=30cm=30xx10^-2m`
A liquid film has two free surfaces. A slider will support the weight when the force of surface tension action upwards on the slider `(2Sl)` balances the downward force due to weight `=(W)`

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