A wire of radius 3 mm and 1.25 m length is to be maintained at 60 degree Celsius

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A wire of radius 3 mm and 1.25 m length is to be maintained at 60 degree Celsius by insulating it by a material of thermal conductivity 0.175 W/m K. The temperature of surrounding is 20 degree Celsius with heat transfer coefficient 8.5 W/ m² K. Find percentage increase in heat loss due to insulation?

Options:

A . 134.46 %

B . 124.23 %

C . 100.00 %

D . 12.55 %

Answer: Option A
Answer: (a).134.46 %

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