The two opposite faces of a cubical piece of iron (thermal conductivity = 0.2 CGS units) are at 100∘ C and 0∘ C in ice. If the area of a surface is 4cm2 , 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(θ1−θ2)lt⇒m=1L×KA(θ1−θ2)l×t =180×0.2×4×(100−0)√4×10×60(∵l2=4⇒l=√4) =0.2×4×100×60080×2=300 gm