Q 11-08-015NEETJEE MainMedium
A wire can hold a maximum load of $100$ kg before breaking. Another wire of the same material, twice as long and with twice the radius, can hold a maximum load of
Answer: (C) $400$ kg
Concept. Breaking load $=$ breaking stress $\times$ area. The breaking stress depends only on the material; the length plays no part.
Step 1. Area. Twice the radius gives $4$ times the area.
Step 2. Load. $4 \times 100 = 400$ kg.
Answer. $400$ kg (Option C).
Solution by Sreeraj P, M.Sc Physics