Q.

The adjacent graph shows the extension (Δ) 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, calculate the Young's modulus of the material of the wire.                    [2003]

1 2×1011 N/m  
2 2×10-11 N/m  
3 3×10-12 N/m  
4 2×10-13 N/m  

Ans.

(1)

Using,  Y=F/AΔ/=FA·Δ=20×110-6×10-4

=2×1011 N/m2