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A wire of cross sectional area 3mm2 is just stretched between two fixed points at a temperature of 20°C. Determine the tension when the temperature falls to 20°C. Coefficient of linear expansion α = 10–5 /°C and Y = 2 × 1011 N/m2.

(1) 120 KN 

(2) 20 N

(3) 120 N 

(4) 102 N

1 Answer

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Best answer

Correct Answer is: (3) 120 N 

F = Y A α Δt

= 2 × 1011 × 3 × 10–6 × 10-5 × 20

F = 120 N.

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