The inside and outside surface of a hollow sphere of radius r and 2 are maintained...

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The inside and outside surface of a hollow sphere of radius r and 2 are maintained at uniform temperature of T and T respectively. The thermal conductivity of spherical material varies as + - Where T is in degree centigrade. Derive an expression for rate of heat transfer through hollow sphere. The inside and outside surface of a hollow sphere of radius r and 2 are maintained at uniform temperature of T and T respectively. The thermal conductivity of spherical material varies as + - Where T is in degree centigrade. Derive an expression for rate of heat transfer through hollow sphere.