An electrical heater 100 mm long and 5 mm in diameter is

An electrical heater 100 mm long and 5 mm in diameter is inserted into a hole drilled normal to the surface of a large block of material having a thermal conductivity of 5 W/m ∙ K. Estimate the temperature reached by the heater when dissipating 50 W with the surface of the block at a temperature of 25°C.

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