A steel wire of cross–sectional area 0.5 mm 2 is held between two fixed supports. If the…
Physics · JEE Main · NTA Exams — Thermodynamics
A steel wire of cross–sectional area 0.5 mm2 is held between two fixed supports. If the wire is just taut at 20°C, determine the tension when the temperature falls to 0°C. Coefficient of linear expansion of steel is 1.2 × 10–5/°C and its Young’s modulus is 2.0 × 1011 N/m2.
- 24 N
- 36 N
- 12 N
- 6 N
Answer
(A) 24 N
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