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**1.**The films of the two liquids are separated by a bar of length l. The coefficients of surface tension of liquids are equal to s1 and s2, respectively. What force acts on the bar on the liquid side?(It is a rectangular surface of 2 liquids separated by a bar of lenght l)

**2.**Force=(surface tension coefficient )*lenght

**3.**I thought that the force which acts on the bar from one side is (surface tension coefficient)*lenght of the bar, but then the result will be the sum of 2 forces, F=l(s1+s2), the answer is wrong according to the book. Where is my mistake?