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A spherical constant temperature heat source of radius r1 is at the center of a uniform solid sphere of radius r2 The rate t which heat is transferred through the surface of thesphere is proportional to
The correct option is (A).The rate H at which heat is transferred through the slab is,(1)directly proportional to the area (A) available.(2) inversely proportional to the thickness of the slab Δx.(3) directly proportional to the temperature difference ΔT.So, H = kA ΔT/ ΔxWhere k is the proportionality constant and is called thermal conductivity of the material.From above we know that, the rate H at which heat is transferred through the slab is directly proportional to the area (A) available.Area A of solid sphere is defined as,
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