# A 2 m long wire of resistance 4 Omega and diameter 0.64 mm is coated with plastic insulation of thickness 0.66 mm. A current of 5A flows through the

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A 2 m long wire of resistance 4 Omega and diameter 0.64 mm is coated with plastic insulation of thickness 0.66 mm. A current of 5A flows through the wire. Find the temperature difference across the insulation in the steady state. Thermal conductivity of plastic is 0.16 xx (10^-2) cal//s cm.^@C.

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Correct Answer - 4.7^(@)C

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