Along the axis of a long cylinder filled with an ideal gas, there is a thin wire of radius r through which a current flows. In this case, constant power is released per unit length q. The temperature T0 of the outer cylinder is maintained constant, its radius R. Find the temperature difference DT between the filament and the cylinder, taking into account the dependence of the thermal conductivity coefficient of the gas on temperature. At temperature T0, thermal conductivity is known and equal to k0.

Answer. Format gif