Q 11-08-002NEETNEET 2023Top questionEasy
Let a wire be suspended from the ceiling (rigid support) and stretched by a weight $W$ attached at its free end. The longitudinal stress at any point of cross-sectional area $A$ of the wire is :
Answer: (B) $W/A$
Concept. Longitudinal stress is the internal force per unit cross-sectional area.
Step 1. Force in the wire. The light wire carries the tension $W$ at every point along its length.
Step 2. Stress.
$$\text{stress} = \frac{W}{A}$$
Answer. $W/A$ (Option B).
Solution by Sreeraj P, M.Sc Physics