A wire of cross-sectional area `3 mm^(2)` is 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 `alpha=10^(-5).^(@)C^(-1) and Y =2 xx10^(11) N//m^(2)`
A. 20 N
B. 30 N
C. 60 N
D. 120 N
