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Q.

A wire of length ‘l’ is bent in the form of a ring and made to float in water. The extra force required to lift it up is F. If the same wire is bent in the form of a square frame then extra force required to lift it up, while floating is

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a

F

b

F2π

c

2πF

d

πF

answer is A.

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Detailed Solution

Extra force = circumference x surface tensionAs in both the cases , circumferences are same. So forces are also same.
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