Properties Of Matter

A wire of length \(\mathrm{L}\) and radius \(\mathrm{r}\) is clamped rigidly at one end. When the other end of the wire is pulled by a force \(\mathrm{F}\), its length increases by \(5 \mathrm{~cm}\). Another wire of the same material of length \(4 \mathrm{L}\) and radius \(4 \mathrm{r}\) is pulled by a force \(4 \mathrm{F}\) under same conditions. The increase in length of this wire is __________________ \(\mathrm{cm}\).