do not solve if u did not study linear elastcity otherwise i give zero

$9\mathrm{.}7.$ Figure $9\mathrm{.}3($a$)$ shows a complete circular ring of inner radius $\backslash ($ a $\backslash )$ and outer radius $\backslash (2$ a $\backslash )$ that is cut along the radius $\backslash ($ A B $\backslash ),$ thus making the body simply$-$connected. The two surfaces are now forced apart and a thin wedge of material of subtended angle $\backslash (\backslash$alpha $\backslash$ll $1\backslash )$ is inserted and welded into place as shown in Figure $9\mathrm{.}3($b$).$

Fig. $9\mathrm{.}3$

Find the stresses in the ring if the material has elastic properties $\backslash (\backslash$mu$,$

u $\backslash )$ and plane stress conditions are assumed.