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Question Number 99900 by Rio Michael last updated on 23/Jun/20

$$\mathrm{An}\mathrm{insulated}\mathrm{wire}\mathrm{of}\mathrm{diameter}1.22\mathrm{mm}\mathrm{carries}\mathrm{a}\mathrm{steady}\mathrm{current}$$$$\mathrm{of}5.4\mathrm{A}.\mathrm{The}\mathrm{insulation}\mathrm{material}\mathrm{is}1.22\mathrm{mm}\mathrm{thick}\mathrm{and}\mathrm{has}\mathrm{a}?$$$$\mathrm{coeffiecient}\mathrm{of}\mathrm{thermal}\mathrm{conductivity}\mathrm{of}0.23\mathrm{W}/\mathrm{Km}.\mathrm{the}\mathrm{electrical}$$$$\mathrm{resistivity}\mathrm{of}\mathrm{the}\mathrm{material}\mathrm{of}\mathrm{the}\mathrm{wire}\mathrm{is}5.2\times {10}^{-7}\mathrm{\Omega }\mathrm{m}.\mathrm{find}\mathrm{the}$$$$\mathrm{temperature}\mathrm{difference}\mathrm{between}\mathrm{the}\mathrm{inner}\mathrm{and}\mathrm{outer}\mathrm{surface}\mathrm{of}$$$$\mathrm{the}\mathrm{insulated}\mathrm{material}\mathrm{when}\mathrm{steady}\mathrm{state}\mathrm{is}\mathrm{reached}.$$

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