If the Bulk modulus of lead is $8.0\times {10}^9 \mathrm{N} {\mathrm{m}}^{-2}$ and the initial density of the lead is $11.4 \mathrm{g} {\mathrm{cc}}^{-1}$, then under the pressure of $2.0\times {10}^8 \mathrm{N} {\mathrm{m}}^{-2}$, the density of the lead is

The load versus elongation graph for four wires of the same material is shown in figure. The thinnest wire is represented by line

In the given figure, if the dimensions of the two wires are same but materials are different, then Young's modulus is

The stress versus strain graph for wires of two materials $A$ and $B$ are as shown in the figure. If $Y_A$ and $Y_B$ are the Young's moduli of the materials, then

As shown in figure, by combining together copper and steel wires of same length and same diameter, a force $F$ is applied at one of their end. The combined length is increased by $2 \mathrm{cm}.$ The wires will have