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A uniform wire of length 20 cm is bent into a circle, it is placed gently on the surface of water of surface tension 0.07 Nm^-1 . The extra force than its weight required to pull it out of the water is

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0.014 N

0.028 N

Zero

0.0035 N

answer is B.

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Detailed Solution

$F = T . 4 πr = T . 2 l = 0 .07 \times 2 \times 0.2 = 0 .028 N$

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