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5. Radius of a soap bubble is ‘r’

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5. Radius of a soap bubble is ‘r’, surface tension of soap solution is T. Then without increasing the temperature, how much energy will be needed to double its radius

(a)    4πr2T (b) 2 πr2T (c) 12 πr2T (d) 24 πr2T Ans. d (54)

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