Heat flow in a solid bounded by two conical surfaces (Fig. 11B.9). A solid object has the shape…

Heat flow in a solid bounded by two conical surfaces (Fig. 11B.9). A solid object has the shape depicted in the figure. The conical surfaces θ1 = constant and θ2 = constant are held at temperatures T1 and T2, respectively. The spherical surface at r = R is insulated. For steady-state heat conduction, find