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Q.

A steel wire (Y=2×1011 Pa, α=11×10−6 /∘C) of a diameter of 2mm is just taut between two fixed points at a temperature of 30oC, find the tension if the temperature falls to 20oC

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a

59.14N

b

39.14N

c

69.14N

d

49.14N

answer is D.

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Detailed Solution

F=πr2YαΔθ=3.14×10−6×20×1012×11×10−6×10=69.14N

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