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The length of a needle floating on water...

The length of a needle floating on water is 2.5 cm. Calculate the added force required to pull the needle out of water `[T=7.2xx10^(-2)N//m]`

Text Solution

Verified by Experts

Force of surface tension `F=Txx2l`
`("":'` Two free surfaces are there)
`impliesF=7.2xx10^(-2)xx2xx2.5xx10^(-2)=3.6xx10^(-3)N`
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