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 that substance which will break under its own weight when suspended vertically is nearly

A) 3.4 m
B) 34 m
C) 340 m
D) 3400 m
Explanation

(b) $10^{6} = \frac{LAdg}{A}$
$\therefore\ \ L = \ \frac{10^{6}}{3 \times 10^{3} \times 9.8}m = \ \frac{1000}{3 \times 9.8} = 34.01m$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

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