A Slab of Material Has Area A, Thickness L, and Thermal

question 89

Multiple Choice

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 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

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