A 2-kW resistance heater wire whose thermal conduc- tivity is k 5 10.4 Btu/h·ft·R has a radius of ro 5 0.06 in and a length of L 5 15 in, and is used for space heating. Assum- ing constant thermal conductivity and one-dimensional heat transfer, express the mathematical formulation (the differential equation and the boundary conditions) of this heat conduction problem during steady operation. Do not solve.

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