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[" 4.Two mercury drops (each of radius ' "r" ') merge to form bigger "],[" drop.The surface energy of the bigger drop,if "T" is the "],[" surface tension,is : "],[[" (a) "4 pi r^(2)T," (b) "2 pi r^(2)T],[" (c) "2^(8/3)pi r^(2)T," (d) "2^(5/3)pi r^(2)T]]

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