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Two thin metallic spherical shells of ra...

Two thin metallic spherical shells of radii `r_(1) and r_(2) `(r_(1)lt r_(2))` are placed with their centres coinciding. A material of thermal conductivity K is filled in the space between the shells. The inner shells. Is maintained at temperature `theta_(1)` .and the outer shell at temperature theta_(2) (theta_(1)lttheta_(2). Calculate the rate at which heat flows radially through the material.

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