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A hollow metallic sphere of radius 20cm ...

A hollow metallic sphere of radius `20cm` surrounds a concentric metallic sphere of radius `5cm`. The space between the two sphere is filled with a nonmetallic material. The inner and outer sphere are maintained at `50^(@)C` and `10^(@)C` respectively and it is found that `100J` of heat passes from the inner sphere to the outer sphere per second. Find the thermal conductivity of the material between the sphere.

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The correct Answer is:
`15 W//m-^(@)C`
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