JAMB Physics 2013 Objective — Question 17
Question 17 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2013 Objective paper, with the correct answer and a full explanation.
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A wire of length 100.0m at 30°C has linear expansivity of 2×10⁻⁵K⁻¹. Calculate the length of the wire at a temperature of -10°C.
- A. 100.08m
- B. 100.04m
- C. 99.96m
- D. 99.92mCorrect
Explanation
Δθ = -10-30 = -40°C. L2 = L1(αΔθ+1) = 100(2×10⁻⁵×(-40)+1) = 100(0.9992) = 99.92m.
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