Q$4$: Choose the correct answer:

A cylindrical rod with uniform thermal conductivity is subjected to radial heat conduction. The rod has an outer radius $R1$ and an inner radius $R2.$ The temperature difference between the inner and outer surfaces is $T.$ In this scenario, what is the primary factor affecting the rate of heat conduction through the rod?

A$)$ Reynolds number

B$)$ Volumetric hydraulic bench

C$)$ Center of pressure

D$)$ Vacuum and gauge pressure

E$)$ Thermal conductivity

In the context of linear heat conduction, the term Fourier's Law is associated with:

A$)$ Reynolds number

B$)$ Vacuum pressure

C$)$ Radial heat conduction

D$)$ Linear heat conduction

E$)$ Center of pressure

The concept used to describe heat transfer in a direction perpendicular to the surface is:

A$)$ Radial heat conduction

B$)$ Reynolds number

C$)$ Linear heat conduction

D$)$ Vacuum pressure

E$)$ Volumetric hydraulic bench