A long wire of resistance and diameter is coated with plastic insulation of thickness

PHYSICS · Subjective · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter

Problem

2\ \text{m}

long wire of resistance

4\ \Omega

and diameter

0.64\ \text{mm}

is coated with plastic insulation of thickness

0.66\ \text{mm}

. A current of

5\ \text{A}

flows through the wire. Find the temperature difference across the insulation in the steady state. The thermal conductivity of plastic is

0.16\times10^{-2}\ \text{cal}\,\text{s}^{-1}\,\text{cm}^{-1}\,{}^\circ\text{C}^{-1}