Find the steady-state temperature distribution in a spherical shell of inner radius 1 and outer radius 2 if the inner surface is held at 0∘ and the outer surface has its upper half at 100∘ and its lower half at 0∘. Hint: r=0 is not in the region of interest, so the solutions r−l−1 in (7.9) should be included. Replace clrl in (7.11) by (alrl+blr−l−1).