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A long solid cylinder (surface 1) of diameter d is enclosed by a another long concentric cylinder of inner diameter d. If d =

A long solid cylinder (surface 1) of diameter d is enclosed by a another long concentric cylinder of inner diameter d. If d = 2d. The percentage radiation from surface 2 to itself is (a) 0% (c) 50% (b) 25% (d) 75%

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