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A 2 m long wire of resistance 4 Omega an...

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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The correct Answer is:
`4.7^(@)C`
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NN GHOSH-HEATING AND CHEMICAL EFFECT OF CURRENT-EXAMPLE B
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