Question

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

(A) OD 

(B) OC 

(C) OB 

(D) OA

Answer 1

Correct option: (A) OD

Explanation: 

If F, L, Y are constant then ℓ ∝ (1/A)

i.e. ℓ ∝ (1 / r²)

i.e. for same load, thickest wire (radius is more) will show minimum elongation. 

From the graph, minimum elongation is shown by graph OD. 

Hence OD must be thickness wire's graph.