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

Options

A. OC
B. OD
C. OA
D. OB

Answer

C

Explanation

Young.s modulues
`=(stress)/("strain")`
Since Young.s modulus is fixed for a material, stress will be same for the same strain (elongation per unit length)
Also, stress=`("load")/("cross-sectional area of the wire")`
Now, for the same elongation, the load is minimum for the line OA. so the thinnest wire is represented by OA.