A long heater wire rated at 2 kW per metre, of diameter 1.0 mm, lies along the axis of a ceramic cylinder of diameter 0.10 m. The wire is at 1200°C and the outside of the ceramic is at 25°C. Find the

Question

A long heater wire rated at 2 kW per metre, of diameter 1.0 mm, lies along the axis of a ceramic cylinder of diameter 0.10 m. The wire is at 1200°C and the outside of the ceramic is at 25°C. Find the thermal conductivity of the ceramic, in W m⁻¹ K⁻¹.

TestHub · Accepted Answer

k = 2 π Δ T P ln ( r 2 ​ / r 1 ​ ) ​ = 2 π × 1175 2000 × ln 100 ​ = 7383 2000 × 4.605 ​ = 1.25 .

Physics - Heat & Thermo Question with Solution | TestHub

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