The two ends of a rod of length L and a uniform cross-sectional area A are kept at two temperatures T1 and T2 (T1 > T2) . The rate of heat transfer, \(\frac{\mathrm{dQ}}{\mathrm{dt}}\) through the rod in a steady state is given by:
1
\(\frac{\mathrm{k}\left(\mathrm{~T}_{1}-\mathrm{T}_{2}\right)}{\mathrm{LA}}\)
2
kLA(T1 − T2)
3
\(\frac{\mathrm{kA}\left(\mathrm{~T}_{1}-\mathrm{T}_{2}\right)}{\mathrm{L}}\)
4
\(\frac{\mathrm{kL}\left(\mathrm{~T}_{1}-\mathrm{T}_{2}\right)}{\mathrm{A}}\)