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A spherical body of radius b=4π m has a concentric cavity of radius a=2π m as shown in the figure. Thermal conductivity of the material is 100 W/m∘C. If temperature of inner surface is kept at 70∘C and of the outer surface at 30∘C, then find the rate of heat flow. (in kW)

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A spherical body of radius b=4π m has a concentric cavity of radius a=2π m as shown in the figure. Thermal conductivity of the material is 100 W/mC. If temperature of inner surface is kept at 70C and of the outer surface at 30C, then find the rate of heat flow. (in kW)






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