A steel rod is clamped at its two ends and rests on a fixes horizontal base. The rod is unstrained at `20^@C`. Find the longitudinal strain developed in the rod if the temperature rises to `50^@C`. Coefficient of linear expansion of steel `=1.2 xx 10^(-5 @)C^(-1)`.

Explanation

To solve the problem of finding the longitudinal strain developed in a steel rod when the temperature rises from \(20^\circ C\) to \(50^\circ C\), we can follow these steps:

### Step 1: Understand the Given Information
- The steel rod is clamped at both ends, meaning it cannot expand freely.
- The initial temperature (\(T_1\)) is \(20^\circ C\).
- The final temperature (\(T_2\)) is \(50^\circ C\).
- The coefficient of linear expansion (\(\alpha\)) for steel is \(1.2 \times 10^{-5} \, ^\circ C^{-1}\).

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