Load-elongation graphs of two wires A and B, made of the same material and of equal initial length are shown in the fig.1.21. Which wire is thicker?

Load-elongation graphs of two wires A and B, made of the same material

1.	Load-elongation graphs of two wires A and B, made of the same material and of equal initial length are shown in the fig.1.21. Which wire is thicker?
Answer» Solution :`Y=(FL)/(al)` or, `a=(FL)/(YL)` (a= area of CROSS section of the wires) F,L and Y are the same for the TWO wires, `therefore a prop 1/l` So the wire of SMALLER elongation has a LARGER cross section. `therefore (a)_A gt (a)_B` Hence , the wire A is thicker than the wire B.