In This post you will get answer of Q.
A metallic wire of density d of floats in water. The maximum radius of the wire, so that it may not sink is
Solution:
The wire does not sink, so net force on it will be zero
$ therefore $ $ mg=T.2l $
$ Rightarrow $ $ {{pi }^{2}}ldg=T.2l $ $ therefore $
$ r=sqrt{frac{2R}{pi dg}} $
Solution:
The wire does not sink, so net force on it will be zero
$ therefore $ $ mg=T.2l $
$ Rightarrow $ $ {{pi }^{2}}ldg=T.2l $ $ therefore $
$ r=sqrt{frac{2R}{pi dg}} $