Q. A substance breaks down by a stress of $10^{6}\ Nm^{- 2}$. If the density of the material of the wire is $3\ \times 10^{3}\ kgm^{- 3}$, then the length of the wire of the substance which will break under its own weight when suspended vertically is

A) 66.6 m
B) 60.0 m
C) 33.3 m
D) 30.0 m
Explanation

(c) $L = \frac{p}{eg} = \ \frac{10^{6}}{3 \times 10^{3} \times 10} = \frac{100}{3} = 33.3\ m$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.