the langth of a needle floating on water...

the langth of a needle floating on water is 2.5 cm . How much minimum force in addition to the weight of the needle, will be needed to lift the needle above the surface of water ? Surface tension of water `=7.2 xx 10^(-4) "Ncm"^(-1).`

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The correct Answer is:

`(3.6xx10^(-3)N)`

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