If the length of a needle floating on wa...

If the length of a needle floating on water is 2 cm then the additional force due to surface tension required to pull the needle out of water will be

`28xx 10^(-4)`N

`32xx10^(-4)`N

`14xx10^(-4)`N

`20xx10^(-4)`N

Text Solution

Verified by Experts

The correct Answer is:

`F = Txx 2l = 7 xx 10^(-2) xx 2 xx 10^(-2) = 28 xx 10^(-4)` N

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