A brass wire 1.8 m long at 27°C is held taut with negligible tension between two rigid…
Physics · Class 11 · CBSE — Mechanical Properties of Solids
A brass wire 1.8 m long at 27°C is held taut with negligible tension between two rigid supports. Diameter of the wire is 2 mm, its coefficient of linear expansion, aBrass = 2 × 10–5 °C–1 and its Young’s modulus, YBrass = 9 × 1010 N m–2. If the wire is cooled to a temperature – 39 °C, tension developed in the wire is
- 2.7 × 102 N
- 3.7 × 102 N
- 4.7 × 102 N
- 5.7 × 102 N
Answer
(B) 3.7 × 10 2 N
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