a$)$ The volumetric heat generation in a solid sphere of radius $R$ is observed to be varying in space

with the relation $q_v(r)=q_{10}[1-(\frac{r}{R})]\frac{W}{m^3}.$ Where $q_{v_0}$ is a known constant. The boundary at

$r=R$ is at a known uniform temperature Twall. Derive an expression for ID$,$ steady state radial

temperature distribution in dimensionless form. Further deduce the relation for rate of heat

transfer.