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A 15mm diameter copper rod losses heat to the syrrounding air with unit surface heat transfer coefficient of 10W/m2K. If the rod is to be

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A 15mm diameter copper rod losses heat to the syrrounding air with unit surface heat transfer coefficient of 10W/m2K. If the rod is to be uniformly coated with a material of thermal conductivity 0,2W/mnK and the coated surface has a heat transfer coefficient of 15W/m2K, find the thickness of the coating which will keep the state of heat loss unchanged

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