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A small blackened solid copper sphere of...

A small blackened solid copper sphere of radius 2.5cm is placed in an evaculated chamber. The temperature of the chamber is maintained at `100^@C`. At what rate energy must be supplied to the copper sphere to maintain its temperature at `110^@C`. (`sigma = 5.76 xx 10^-8 Js^-1m^-2K^-4`) Treat sphere as black body.

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