Q. 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) $OA$
Explanation
(a) $l = \frac{FL}{AY}\therefore l \propto \frac{1}{r^{2}}\ \lbrack Y,L$ and $F$ are constant]
$i.e.$ for the same load, thickest wire will show minimum elongation. So graph $D$ represent the thickest wire
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.