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A copper busbar of length 40 cm carries electricity and produces 4.8 W in joule heating. The cross-section is square, as shown in the figure, and is covered with insulation of thermal conductivity 0.036 W/mK. All four sides are cooled by air at 20 C with an average heat transfer coefficient of 18 W/m^2 K. Assuming the copper is isothermal, estimate the maximum temperature of the insulation.

A copper busbar of length 40 cm carries electricity and produces 4.8 W in joule heating. The cross-section is square, as shown in the figure, and is covered with insulation of thermal conductivity 0.036 W/mK. All four sides are cooled by air at 20 C with an average heat transfer coefficient of 18 W/m^2 K. Assuming the copper is isothermal, estimate the maximum temperature of the insulation.