$\begin{array}{1 1}(A)\;24KN\\(B)\;36KN\\(C)\;18KN\\(D)\;20KN\end{array} $

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$\large\frac{\Delta l}{l}=\frac{2\pi r_2-2\pi r_1}{2\pi r_1}$

$\Rightarrow \large\frac{.8-.5}{.5}$

$\Rightarrow \large\frac{3}{5}$

As stress=Y$\times$ strain

$F=3\times 10^{10}\times \large\frac{3}{5}$$\times 2\times 10^{-6}$

$\;\;\;=\large\frac{18}{5}$$\times 10^4$

$\;\;\;=36KN$

Hence (B) is the correct answer.

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