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PhysicsJEE Main 24 Jan 2026, Shift 1·Q14·MCQ·Easy–moderate

Thermal Properties of Matter · Temperature and expansion

A brass wire of length 2 m and radius 1 mm at 27∘27^\circC is held taut between two rigid supports. Initially it was cooled to a temperature of −43∘-43^\circC creating a tension TT in the wire. The temperature to which the wire has to be cooled in order to increase the tension in it to 1.4T1.4T, is ∘^\circC
  1. (1)−86-86
  2. (2)−71-71
  3. (3)−65-65
  4. (4)−80-80

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