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Properties of Matter Part 3

Section: Physics

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Question : 4

Total: 92

A brass wire of length 2 m and radius 1 mm at 27∘C is held taut between two rigid supports. Initially it was cooled to a temperature of −43∘C creating a tension T in the wire. The temperature to which the wire has to be cooled in order to increase the tension in it to 1.4T, is ____ ‌∘C.

[24 jan 2026 Shift 1]

-71
-80
-65
-86

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