Suppose that it takes tensile forces of magnitude F to produce a given strain L /

Suppose that it takes tensile forces of magnitude F to produce a given strain Δ L / L in a steel wire of cross sectional area A. If you had two such wires side by side and stretched them simultaneously, what magnitude tensile forces would be required to produce the same strain? By thinking of a thick wire as two (or more) thinner wires side by side, explain why the force to produce a given strain must be proportional to the cross-sectional area. Thus, the strain depends on the stress-the force per unit area?