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Q.

A needle of 12cm long is on the surface of water. The extra force required, over its weight, to take it out from the surface of water is________ $\times 10^{- 4} N$ (surface tension =72 dyne $c m^{- 1}$ )
(Round off to nearest integer)

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answer is 173.

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Detailed Solution

$T = \frac{F}{2 l} \Rightarrow F = (2 l) (T)$

$= 2 (12) (10^{- 2}) (72 \times \frac{10^{- 5}}{10^{- 2}}) = 0.01728 N$

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A needle of 12cm long is on the surface of water. The extra force required, over its weight, to take it out from the surface of water is________×10−4N(surface tension =72 dyne cm−1)(Round off to nearest integer)