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

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$\large\frac{\Delta l}{l}$$=\alpha \Delta \theta$

$\Rightarrow 11\times 10^{-6}\times 20$

$\Rightarrow 2.2\times 10^{-4}$

$a=\pi r^2$

$\;\;\;=\pi(\large\frac{5}{2}$$\times 10^{-3})^2$

$F=Y\times \large\frac{\Delta l}{l}$$\times a$

$\;\;\;=2.1\times 10^{11}\times 2.2\times 10^{-4}\times \pi\times \large\frac{25}{4}$$\times 10^{-6}$

$\;\;\;=907N$

Hence (D) is the correct answer.

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