NEET Physics Thermal Expansion MCQ Question
A copper rod of length 100 cm is heated from 20°C to 100°C. Given that the coefficient of linear expansion for copper is 1.7 × 10⁻⁵ K⁻¹, what is the increase in length of the rod?
36 mm
70 mm
36 cm
70 cm
Correct Answer
Detailed Explanation
The increase in length is calculated using the formula Δl = αₗ × l × ΔT, where αₗ is the coefficient of linear expansion, l is the original length, and ΔT is the temperature change. Here, Δl = 1.7 × 10⁻⁵ K⁻¹ × 100 cm × 80 K = 1.36 mm.
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