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[" 79.The surface tension of a soap solu...

[" 79.The surface tension of a soap solution is "2times10^(-2)N/m" .To "],[" blow a bubble of radius "1cm," the work done is : "],[[" (a) "4 pi times10^(-6)J," (b) "8 pi times10^(-6)J],[" (c) "12 pi times10^(-6)J," (d) "16 pi times10^(-6)J]]

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