A hellow sphere has inner and outer surface area of 2m2 and 8 m2 respectively for a given temperature difference across the surface , the heat flow
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Concept of Geometric mean area
∴ Ag=√A1A2
=√2∗8
=√16
=4
∴ Ag = 4m^2
∴ Ag=√A1A2
=√2∗8
=√16
=4
∴ Ag = 4m^2
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