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A thin wire is bent in the form of a ring of diameter 3.0 cm . The ring is placed horizontally on the surface of soap solution and then raised up slowly . How much upward force is necessary to break the vertical film formed between the ring and the solution ? surface tension of a soap solution `=3.0 xx 10^(-2) "Nm"^(-1).`

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The correct Answer is:
`(5.65 xx 10^(-3)N)`
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