Verified Solution • 2025–26 Session moderate

QPages 12-14: Q26: HC Verma: Concepts of Physics - Volume 2 Heat and Temperature Pages 12-14: Q26 Solution: A steel rod of length 1 m rests on a smooth horizontal base. If …

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often equate a stress‑free condition with zero strain, forgetting that strain measures the relative change in length. Even when the rod is free to expand, its longitudinal strain is $\varepsilon = \alpha\Delta T$ (non‑zero), not zero.

A steel rod of length 1 m rests on a smooth horizontal base. If it is heated from 0�C to 100�C, what is the longitudinal strain developed?

Step-by-Step Verified Solution

**Answer:** Strain =0= 0 **Step-by-Step Explanation:** The rod rests on a smooth horizontal base, so it is free to expand. No constraint means no stress and no strain. Longitudinal strain = 0.

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