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[" When two soap bubbles of radius "r_(1)" and "r_(2)(r_(2)>r_(1))" ,"],[" coalesce,the radius of curvature of common surface "],[" is: "],[[" (a) "r_(2)-r_(1)," (b) "(r_(2)-r_(1))/(r_(1)r_(2))],[" (c) "(r_(1)r_(2))/(r_(2)-r_(1))," (d) "r_(2)+r_(1)]]

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