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74. A wire of cross-sectional area  is

A wire of cross-sectional area  is 3mm2 first stretched between two fixed points at a temperature of 20°C. Determine the tension when the temperature falls to 10°C. Coefficient of linear expansion α=10-5 °C-1 and  Y=2×1011 N/m2

(a) 20 N                                                 (b)   30 N

(c)   60 N                                               (d)   120 N

Answer-c

(31)

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