Question

A wire of cross-sectional area is first stretched between two fixed points at a temperature of 20°C. Determine the tension when the temperature falls to 10°C. Coefficient of linear expansion and $Y = 2 \times 10 ^ { 11 } \mathrm {~N} / \mathrm { m } ^ { 2 }$

• A. 20 N
• B. 30 N
• C. 60 N
• D. 120 N

Answer 1

Answer: (C)

60 N

Answer 2

$F = Y A \alpha \Delta t$