A steel wire , of uniform area `2mm^2` , is heated up to `50^@C` and is stretched by tying its ends rigidly . The change in tension , when the temperature falls from `50^@C " to " 30^@C` is (Take `Y=2xx10^(11)Nm^(-2) , alpha=1.1xx10^(-5^@C-1))`

Options

A. `1.5 xx 10^(10)N`
B. `5 N`
C. `88 N`
D. `2.5 xx 10^(10) N`

Answer

C