A slab of material has area A, thickness L, and thermal conductivity k. One of its surfaces (P) is maintained at temperature T1 and the other surface (Q) is maintained at a lower temperature T2. The rate of heat flow by conduction from P to Q is:
A. kA(T1 ? T2)/L2
B. kL(T1 ? T2)/A
C. kA(T1 ? T2)/L
D. k(T1 ? T2)/(LA)
E. LA(T1 ? T2)/k
Ans: C. kA(T1 ? T2)/L
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