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Question

Two opposite faces of a cubical piece of iron (thermal conductivity = 0.2 CGS units) kept in ice are at 100 oC and 0 oC. If the area of a surface is 4 cm2, then the mass of ice melted in 10 minutes will be

A
30 gm
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B
300 gm
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C
5 gm
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D
50 gm
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Solution

The correct option is B 300 gm
Q=mL=KA(θ1θ2)lt
m=1L×KA(θ1θ2)lt =180×0.2×4×(1000)4×10×60 (l2=4) =0.2×4×100×60080×2 =300 gm

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