Question

The length of a metallic rod is 5m at 0°C and becomes 5.01 m, on heating upto 100°C. The linear expansion of the metal will be

• A. 2.33 × 10^–5 /°C
• B. 6.0 × 10^–5 /°C
• C. 4.0 × 10^–5 /°C
• D. 2.0 × 10^–5 /°C

Answer 1

Answer: (D)

2.0 × 10^–5 /°C

Answer 2

$\alpha = \frac{\Delta L}{L_{0} \times \Delta\theta} = \frac{0.01}{5 \times 100} = 2 \times 10^{- 5}/{^\circ}C$