The load versus elongation graph for four wires of the same materials shown in the figure. The thinnest wire is represented by the line

• A

  $O C$
• B

  $O D$
• Correct answer
  C

  $\mathrm{OA}$
• D

  $O B$

Solution

It is clear from the graph that, for same value of load $(F)$, elongations $\mathrm{q}, l_{2}, l_{3}, l_{4}$ are such that $$ l_{4}>l_{3}>l_{2}>l_{1} $$ So, OA represents the thinnest wire.

Hence, the correct answer is option: 'C'.