First slide
Elastic behaviour of solids

Figure shows a graph of the extension (A) of a wire of length 1 m suspended from the top of a roof at one end and with a load W connected to the other end. If the cross-sectional area of the wire is 10-6m2 , the Young's modulus of the material of the wire is x×1011N/m2. The value of x is 


 Stress = force  area =WA: Strain =Δll. Young's modulus is given by

Y= stress  strain =W/AΔl/l=WΔl×lA  ……..(i)

Now, slope of graph is ΔlW=4×10480m/N. Using this in i), we get  (given l=1m and A=106m2 ) 


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