A steel wire 5mm in diameter is fixed between 2 clamps at $30^{\large\circ}C$.The temperature is increased to $30^{\large\circ}C$.Find the tension at $50^{\large\circ}C$ if linear expansion of steel is $11\times 10^{-6}/^{\large\circ}C$ and $Y_{steel}=2.1\times 10^{11}N/m^2$

Question

$\begin{array}{1 1}(A)\;900N\\(B)\;897N\\(C)\;800N\\(D)\;\text{None of above}\end{array}$