Q$2($b$)$

If we changed the above thin$-$walled section to a thin$-$walled angle $[$Figure Q$2($b$)]$

$1)$ Locate the shear center for the concentrated loading again that can make the beam free from torsion.

$2)$ Determine the orientation of the principal axes and the principal moments of inertia.

$3)$ Assume that the concentrated loading is located at the shear center where you calculated in the Q$2($b$),$ determine the orientation of the neutral axis and the bending stress at the fixed end at point A$.(7$ marks$)$