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. OD
B. OC
C. OB
D. OA

Answer

A

Explanation

(a) Elongation of the wire
`Deltal=(FL)/(AY)`
`therefore Deltal prop (1)/(r^(2))" "`(Y, L and F are constants)
i.e., for the same load, thickest wire will show minimum elongation. So, line OD represent the thickest wire.