Two opposite faces of a cubical piece of iron (thermal conductivity = 0.2 CGS units) kept in ice are at 100 oCand 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(θ1−θ2)lt ⇒m=1L×KA(θ1−θ2)lt=180×0.2×4×(100−0)√4×10×60(l2=4)=0.2×4×100×60080×2=300gm