The heat flow equation through a sphere of inner radius (r_{1}) and outer radius (r_{2}) is to
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The heat flow equation through a sphere of inner radius \(r_{1}\) and outer radius \(r_{2}\) is to be written in the same form as that for heat flow through a plane wall. For wall thickness \(\left(r_{2}-r_{1}\right)\), the equivalent mean radius for the spherical shell is:
(a) \(\frac{r_{1}+r_{2}}{2}\)
(b) \(r_{1} r_{2}\)
(c) \(\sqrt{r_{1} r_{2}}\)
(d) \(\frac{r_{1}+r_{2}}{\log _{e}\left(r_{2} / r\right)}\)
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