A 2 cm thick slab of commercial thermocole, 100 cm2 in cross-section and having thermal conductivity 2 x 10-4 cal sec-1 cm-1 (Co)-1 has insulating regions differing by 100°C.The quantity of heat flowing through it in a day will be:

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20.4 kcal

43.2 kcal

86.4 kcal

63.6 kcal

answer is C.

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Detailed Solution

Use dQdt=KA(T1-T2)l

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