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Q.

A uniform wire of 20 cm long 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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a

0.014 N

b

0.028 N

c

zero

d

0.0035 N

answer is B.

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Detailed Solution

additional force required to lift  is F=T×2l     =0.07×2×20×10−2=0.028 N
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