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

Explanation

`"Weight "=" maximum force of Surface Tension"`
`Mg=T[2l]" "rArr rho(pir^(2))lg=T(2l)`
`r_("max")=sqrt((2T)/(pirho g))" "(rho" is the density of the wire")`
`D_("max")=2r_("max")=sqrt((8T)/(pi rhog)),A_("max")=pir^(2)=(2T)/(rhog)`
In this case surface tension helps for floating.
Note : In the above problem, for a given radius of the wire, whatever may be the length of the wire, it floats on the liquid surface.