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[" 29.A very thin metallic shell of radi...

[" 29.A very thin metallic shell of radius "r" is heated to "],[" temperature "T" and then allowed to cool.The rate "],[" of cooling of shell is proportional to "],[[" (1) "rT," (2) "(1)/(r)],[" (3) "r^(2)," (4) "r^(0)]]

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