Physics · Thermal Properties of Matter
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.
- 1-80
- 2-65
- 3-71✓
- 4-86
Correct answer
-71
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