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Q.

A metallic wire of diameter “d” is lying horizontally on the surface of water. The maximum length of wire so that is may not sink will be

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a

2Tπdg

b

2Tgπd

c

2πdTg

d

any length

answer is D.

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Detailed Solution

mg=2Tl⇒πr2lρg=2Tl⇒πr2ρg=2Tthe expression is independent of length
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