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The length of a needle floating on water is `2.5 cm`. The minimum force in addition to its weight needed to lift the needle above the surface of water will be (surface tension of water is `0.072 N//m`)
A. `3.6xx10^(-3)N`
B. `10^(-2)N`
C. `9xx10^(-4)N`
D. `6xx10^(-4)N`

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Best answer
Correct Answer - A
Surface tension force
`F=Sxx2l=0.072xx2xx2.5/100=3.6xx10^(-3)N`

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