1.
A 2 m2\,\text{m} long wire of resistance 44 ohm and diameter 0.64 mm0.64\,\text{mm} is coated with plastic insulation of thickness 0.06 mm0.06\,\text{mm}. When a current of 55 ampere flows through the wire, find the temperature difference across the insulation in steady-state if K=0.16×102 cal cm−1  ∘C−1s−1K = 0.16 \times 10^2\,\text{cal cm}^{-1}\;^\circ\text{C}^{-1}\text{s}^{-1}